HIV Self-Testing Uptake and Intervention Strategies Among Men in Sub-Saharan Africa: A Systematic Review

Background: HIV testing is an essential gateway to HIV prevention and treatment services. However, HIV testing uptake remains low among men due to stigma, discrimination, and confidentiality concerns. HIV self-testing (HIVST) is an alternative HIV testing method that can address many of these barriers for men. We conducted a systematic review to examine HIVST uptake and intervention strategies among Men in Sub-Saharan Africa. Methods: We used a systematic approach to survey literature published from January 2010 to June 2020 using five electronic databases (PubMed-Medline, CINAHL Complete, PsychINFO, Google Scholar, and Web of Science) and a manual search. Studies were included if they were peer-reviewed, published in English, and examined HIVST willingness, uptake, and/or linkage to care and included men in Sub-Saharan Africa. Results: Sixty-three articles related to HIVST were reviewed. Of the included articles, 37 discussed HIVST uptake/acceptability and 24 discussed intervention strategies. Both oral swab and finger-prick methods had high acceptability with ease of access and availability of the test cited as important by men. Free HIVST kits were preferred by men. Secondary distribution of kits via peers, sexual partners, and female sex workers were successful. Conclusion: HIV self-testing is highly acceptable to men. More efforts are needed to develop policies to implement HIVST programs targeting men in Sub-Saharan Africa, including a focus on linkage to care in sub-Saharan Africa. Future interventions should directly target men independently in tandem with using peers and their romantic partners to promote self-testing among men in sub-Saharan Africa. HIVST kit distribution strategies should be combined with services that can offer confirmatory tests and counseling for men as well as linkage to care.


INTRODUCTION
As of 2018, almost 37.9 million people worldwide were infected with HIV (1), with only 75% of people living with HIV (PLWH) globally being aware of their HIV status (1). The Joint United Nations Programme on HIV/AIDS (UNAIDS) responded by developing an ambitious treatment plan to end the HIV/AIDS epidemic. The objective was for 90% of all PLWH to become aware of their HIV status, 90% of those be linked to sustained antiretroviral treatment (ART) so that 90% of people receiving ART could achieve viral suppression (2). HIV testing is an essential gateway to initiate HIV prevention and treatment services. Yet, most individuals who are at high risk of contracting HIV or who are already infected with HIV are not accessing HIV testing at a high enough rate due to fear of stigmatization, inadequate treatment by healthcare workers, and/or confidentiality concerns (2). In sub-Saharan Africa, the increasingly widespread availability of HIV testing remains hindered by the perceived psychological burden of having to live with HIV, financial barriers, as well as gender inequality (3). Furthermore, men in sub-Saharan Africa are less likely to be self-aware of their HIV status compared to their female counterparts (3). This can be attributed to the exposure of women to HIV testing through antenatal services as well as to misguided masculinity norms (4,5). In nations like Uganda and Tanzania, a lack of knowledge of HIV status is the limiting factor in getting people to engage in prevention and treatment programs (6). The 2016-2017 Tanzania HIV Impact Survey showed that only 45% of men living with HIV (MLWH) were aware of their positive HIV status (7). Eighty-six percent of MLWH who knew their HIV status reported initiation of ART, and 84% of those undergoing ART had been virally suppressed and were significantly less likely to transmit HIV to others (6). HIV screening is a hallmark in being able to provide linkage to care and in turn halt the transmission of HIV. Various interventions have been employed throughout the last decade to determine the most effective way of encouraging men to get tested for HIV, including antenatal clinicbased testing for upcoming fathers, community-based testing, workplace testing, home-based testing, and most promising of all, self-testing.
HIV self-testing (HIVST) is an alternative HIV testing method that can overcome many barriers to testing, including stigma, privacy concerns, time and expense associated with traveling and waiting at the clinic for men. In HIVST an individual can use a kit to collect a specimen, perform the test (usually a rapid diagnostic test) which screens for HIV-1/2 antibodies or the HIV-1 p24 antigen (8), and interpret the test results for themselves. A positive result requires confirmatory testing at a clinical facility which allows for more accurate diagnoses as well as for those persons to easily become linked to ART (8). This promising approach overcomes the initial stigmatization of HIV testing by promoting privacy and security (8). In 2018, the World Health Organization (WHO) reported that 59 countries worldwide had taken up HIVST and 53 additionally were developing policies (8). However, around two thirds of these nations have upper middle-or high-income status, including Australia, Brazil, France, Moldova, the UK, and USA (8). HIVST pricing in low-to middle-income countries, like those in sub-Saharan Africa, is expected to decrease significantly thanks to the Bill & Melinda Gates Foundation's recent agreement to support the affordable sale of Oraquick Self-Testing Kits in order to continue the scale-up of HIV testing in these higher risk areas (9). In November 2018, the UNITAID Self-Testing Africa Initiative distributed nearly 2.3 million HIVST kits in East and South Africa, with a significant number given to countries like South Africa, Zimbabwe, Malawi, Zambia, eSwatini, and Lesotho (9). Between 2015 and 2017, nearly 628,700 self-test kits were distributed to Malawi, Zambia, and Zimbabwe, with close to half of all people self-testing being men and between 14 and 27% not having previously tested for HIV (9). One study in Kisumu, Kenya that distributed self-test kits to women receiving antenatal services for their male partners, discovered that 90.8% of male partners had tested for HIV in the self-testing group compared to only 51.7% of partners in the facility-based testing group (10). Another study performed by PopART in Zambia that observed the rate of uptake when HIVST were distributed door-to-door showed success in increasing awareness of HIV status among men (11).
We conducted a systematic review to examine the HIVST literature focusing on men in Africa. While past research has presented findings from a global review regarding HIVST (12)(13)(14)(15)(16)(17), there are currently no systematic reviews published for HIVST uptake and intervention strategies among men in sub-Saharan Africa. In this review, we aim to systematically identify relevant articles to address this gap and to provide implications for future research.

METHODS
This review adopted and followed the guidance provided by the Preferred Reporting Items for Systematic Reviews and Meta Analyses (PRISMA) (18) and was registered with PROSPERO (registration number: CRD42020138729). A literature search was completed by a trained librarian for articles which matched the criteria for inclusion. To ensure ample coverage in the search process, the following electronic databases were surveyed: CINAHL, PsycINFO, PubMed, Web of Science, and Google Scholar. Both Boolean-paired keywords and controlled vocabulary pertaining to HIVST strategies for men in sub-Saharan Africa were used. Search strategies included terms, such as HIV, HIV self-testing, HIVST, HIV testing, Self-Testing, Men, Male(s), Willingness, Uptake, Intervention(s), Africa, Sub-Saharan Africa, West-Africa, East Africa, southern Africa, and all sub-Saharan African country names.

Inclusion Criteria
Articles were included in this review if they met the following criteria: (1) the research was conducted in sub-Saharan Africa, (2) reported findings on HIVST, among men aged 16 years or older, (3) the research was peer-reviewed and published in English. Articles were excluded if the research was unpublished, if they were written in languages other than English, or if they were not published between January 2010 and June 2020. Articles were considered to be "current literature" if they were published within the past 10 years; therefore, articles published prior to this time were not included in this review. The included articles focused on men who were deemed as being at-risk for HIV infection and living in sub-Saharan Africa.

Data Extraction
Two research team members independently reviewed the results of the database search in an Endnote file. The team members first reviewed the titles and abstracts of all articles, after duplicate articles were removed, in order to assess the relevance of each article. The articles were grouped into one of two categories, either "Selected for Full-Text Review" or "Does Not Meet Inclusion Criteria." Data were then extracted from the articles categorized as selected for full-text review. Ninety-seven articles were selected to be reviewed in full. The two research members summarized the selected articles according to their methods and findings with the aim of assessing if they met the full inclusion criteria. The research members also independently read the included articles in their entirety and summarized their methods, design, and results in order to confirm the appropriateness for being included in the final sample of included articles. Any discrepancies or confusion pertaining to the included articles for which consensus could not be reached by the two research members, was settled by a third research team member.

Quality Assessment
In order to assess the methodological and research quality of each article that is included in this review, appropriate quality assessment tools were used. Two team members independently rated each included article using a pre-determined and agreed upon acceptable scoring requirement for each assessment. The Critical Appraisal Skills Programme (CASP) (19) was used to evaluate qualitative studies; included articles had to meet at least seven of ten listed criteria. Included articles evaluated using the Quality Assessment Tool for observational cohort and crosssectional studies (20) were required to meet at least eleven of fourteen listed criteria. Included articles evaluated using the Cochrane Risk of Bias Tool for randomized trials (21) were required to have a low level of assessed bias in the four domains (selection, performance, attrition, and other). Studies that scored poorly on either of the quality assessment tools were removed from inclusion.

Chosen Methodology
A narrative synthesis approach was used to present the results of this review. Narrative synthesis allows for the synthesis of the findings of multiple studies in a qualitative manner (22). We organized each article by themes, such as HIVST uptake and intervention strategies. The findings of each article were matched with their appropriate theme; however, some articles were included in multiple themes.

HIVST Knowledge
Regarding knowledge of HIVST, in Uganda, researchers found that most participants had never heard of HIVST (23). In Tanzania, A lack of knowledge was found for HIVST with only 22% of participants having heard of HIVST (27). In another study, most healthcare users (HCU) (69.9%), consisting of both men and women reported having heard of HIVST in South Africa (30). Additionally, in South Africa, only 3.9% of men had ever heard of oral HIVST prior to the study (47). Lastly, less than half of students (46.2%) knew what HIVST was prior to the administration of a survey in South Africa (50).
In South Africa, preferences of testing were associated with patient autonomy, violation of human rights, confidentiality and privacy, fear of discrimination and stigma, and an aversion to mandatory face-to-face counseling with participants favoring HIVST for these reasons (57). One cross-sectional study from Malawi, Kenya, and South Africa reported that participants were in support of the idea of an accurate, easy-to-use, rapid HIVST and believed that this could increase testing across all populations (58). Furthermore, in Uganda, both men and women believed HIVST was a strategy that could address men's lack of time to go to the health facilities to test for HIV (49). In South Africa, in support of the testing method, HIVST was deemed acceptable (55). In Kenya the acceptability rate for  post-partum women partners were split in their preferences for the three partner testing modalities. Most women and male partners thought home-based testing and secondary distribution of HIV self-test kits were acceptable. Secondary distribution of HIVST kits was thought to be convenient, ensured confidentiality, allowed men to avoid the clinic, and allows for couples testing privately. Home-based testing was thought to be convenient and would provide savings in time and transport money, and helpful to have health workers present to provide counseling.

Janssen et al. (37) South Africa
Men and women Observational cohort study 14 men; 16 women A smartphone app used in tandem with an oral HIVST was able to help people through the self-testing process by providing counseling and care and simplifying the process of self-testing. The app was able to multiple common HIV testing barriers, such as lack of confidentiality, wait times and testing locations. The app also enabled testing services outside a clinic context or within a clinic; however, an additional layer of privacy was added by using the app. Participants were able to use the app-based HIVST strategy unsupervised at home, unsupervised alone at the Kiosk around the clinic, or supervised under direct supervision of staff at the clinic.    HIVST was 94% (41). Both oral fluid (OF) and finger-stick (FS) methods had high acceptability of which ease of access and the availability of the test were cited as being of importance (38) and FS was preferred to OF tests, both in South Africa (72). In Kenya, self-testers preferred OF vs. FS (80). However, South African participants believed that the acceptability of home OF uptake would not necessarily lead to higher uptake of the test (46). Furthermore, participants also believed that men would show the most interest in using home OF compared to their female counterparts (46). In Zimbabwe, door-to-door delivery of kits was highly preferred compared to kit distribution to batch deliveries (54). After being informed about HIVST, 91% of participants reported being comfortable with using a selftest; 87% believed that HIVST would increase their likelihood of testing in Zambia (59). Still, naïve testers were confident in performing unsupervised HIVST but reported desiring more counseling support during the testing process in South Africa (32). South African men deemed HIVST acceptable because of its convenience and efficiency (33). In South Africa, participants deemed HIVST acceptable due to its privacy, ease of use, and trustworthiness (53). HIVST acceptability was high among the students (87.1%) (50). In South Africa, researchers found that participants had a high average usability index of 93.8% for HIVST (44). In Tanzania, participants reported positive attitudes toward HIVST, supportive perceived norms, and self-efficacy (51). In Malawi and Zambia, most women and male partners thought home-based testing and secondary distribution of HIV self-test kits were acceptable (36). In Uganda, women believed that HIVST could help to improve couples' HIV testing (48). In Kenya, truck drivers, who had previous testing experience, preferred oral testing and counseling via telephone while drivers with no testing experience preferred clinic-based testing (79). In Malawi and Zambia, of three male partner HIV testing strategies (HIV partner notification, partner HIV self-testing and partner home-based HIV testing) most participants (both men and women) accepted all three partner testing modalities; however, male partners were split in their preferences for the three partner testing modalities (36). Key stakeholders perceived HIVST as an effective initiative that may be used to increase uptake of testing services for underserved populations in Rwanda (29). In South Africa, some 96.6% of participants found HIVST easy to use (44) and Individual motivations for HIVST included perceived benefits of access to treatment. HIVST was regarded as convenient, confidential, reassuring and an enabling new way to test with one's partner (39). In Senegal, most participants (74.5%) were comfortable using HIVST, 86.1% found the instructions easy to follow, and 94.4% believed their family or friends would use it (43). Participants in Uganda believed there were benefits associated with HIVST, such as privacy, convenience (55), and being able to test before sex (23). In Rwanda, most HCU (81.2%) perceived HIVST as a strategy that could lead to more people knowing their HIV status (30). In Malawi, individual motivations for HIVST included perceived benefits of access to treatment; HIVST was regarded as confidential, reassuring and as a novel way to test with one's partner (40). South African stakeholders, consisting of two government officials, four non-governmental organization stakeholders, two donors, three academic researchers, and one international stakeholder, expressed high enthusiasm regarding HIVST, its scale-up, and the development of HIVST policies and programming (45). Secondary distribution of HIVST kits was thought to be convenient, ensured confidentiality, allowed men to avoid the clinic, and allows for couples testing privately in Malawi and Zambia (36). Home-based testing was thought to be convenient and would provide savings in time and transport money, and helpful to have health workers present to provide counseling (36). In South Africa, 22% of participants preferred HIVST; however, 66% of participants (mostly men) preferred client-initiated testing (56). In Malawi, male partners reported a preference for HIVST due to its perceived privacy and reduction of associated stigma (26). In Kenya, almost all testers stated they would like to use HIVST again in the future, and that they were likely (19%) or very likely (80%) to recommend self-testing to a friend, partner or family member (76). Also, 97% of recruited men and 100% of seeds (peer distributors) reported being willing to recommend HIVST to their friends and family in Malawi (63).
In South Africa, a smartphone app used in tandem with an oral HIVST was able to help people through the self-testing process by providing counseling and care and simplifying the process of self-testing (37). The app was able to multiple common HIV testing barriers, such as lack of confidentiality, wait times, and testing locations (37). The app also enabled testing services outside a clinic context or within a clinic; however, an additional layer of privacy was added by using the app (37). Participants were able to use the app based HIVST strategy unsupervised at home, unsupervised alone at the Kiosk around the clinic, or supervised under direct supervision of staff at the clinic (37).

Willingness to Use HIVST
In Tanzania, 65% of participants were willing to use HIVST in the future (27) and HIVST willingness was high among both male ever-testers and never-testers with 72% of ever-testers vs. 67% of never-testers reported being willing to self-test (28). Most women were willing to take the kits to their male partners and male partners reported being willing to use HIVST kits provided to them by their female partners in Uganda (48). Participants reported being willing to use HIVST if it included telephone counseling and if it were available in their communities in South Africa (56). Three-quarters of students were willing to purchase an HIVST kit and many reported being willing to self-test with their partners in South Africa (50).

Uptake
Broadly, several community-based HIVST interventions throughout sub-Saharan Africa reported that the most significant impact has been with adult men, with an average of 1,500 HIV infections averted (24). HIVST was found to be advantageous when provided in combination with existing services, which resulted in several distribution models having high male participation in Malawi, Zambia, and Zimbabwe (34). Uptake of oral HIVST was reported as 25.4% in South Africa (47). One study conducted in Malawi reported that 76.5% of residents self-tested during a 12-month period (25). In South Africa, almost all men who have sex with men (MSM) (91%) self-tested and most men (80%) preferred HIVST to testing at a clinic (73). Furthermore, an overall estimated uptake of HIVST >80% was reported with uptake being greater among women than men (25). Also, 91.9% of participants chose to self-test following a demonstration and illustrated instructions (62). Both accessibility and availability to HIVST were influential to uptake as described in a study from Ethiopia (38).
Finally, both unsupervised and supervised HIVST were preferred across sub-Saharan populations for varying reasons. In Johannesburg, South Africa, it was reported that 68.7% of participants selected unsupervised HIVST, while 25% opted for supervised HIVST and 6.3% chose semi-supervised (42). In Mozambique, when asked to choose a test to be administered, over 80% of participants selected to perform directly assisted HIVST compared to standard FS testing and of those who selected HIVST, 20% opted to perform HIVST at home (35). Still, more than three-fourths of participants (76%) opted to perform HIVST at the health center due to the presence of a counselor (35).

HIVST Barriers
In Uganda, perceived barriers for HIVST included the absence of professional support, poor disposal of kits, and delayed linkage to care (23). Participants in Malawi sometimes required persuasion even though they believe HIVST is more flexible than traditional testing (40). Perceived barriers included a lack of counseling and difficulty in ensuring linkages to care among those with positive results in South Africa (45). Participants had concerns (potential suicidality) regarding the lack of HIV counseling associated with HIVST in South Africa (55). Participants from Central Uganda reported skepticism regarding HIVST and whether the kits could actually test for HIV, but this was not a deterrent to its utilization (49). Also, in a cross-sectional study from Malawi, Kenya, and South Africa, it was reported that participants found instructions for HIVST to be confusing and/or difficult to follow (52). Less than 25% of participants completed the test successfully without errors (52). Results interpretation was difficult for participants (52). In South Africa, errors were committed by participants in both the oral fluid (OF) and finger stick (FS) group; however, most participants successfully performed the OF test while FS was less consistent. Lastly, in 10% of participants needed help or made errors while using HIVST kits in Malawi (62).

INTERVENTION STRATEGIES
Twenty-four articles reported various intervention strategies regarding HIVST. Strategies included choices of testing strategies, cost/financial incentives, distribution strategies, and miscellaneous strategies.

Choices/Options of Testing
In Kenya, participants were presented with options of making trade-offs between different characteristics of HIV testing service delivery models by making hypothetical choices in a series of paired HIV testing scenarios to identify which HIV testing characteristics influenced the selection of preferred options (79). In Uganda, when presented as a choice, distribution of HIVST kits at local pharmacies reported the lowest predicted uptake and was higher among men who perceive a higher relative risk of having HIV (78).
Participants were recruited from two roadside wellness clinics in Kenya and were randomized on a 1:1 basis to either the standard of care (SOC) arm (provider-administered FS test) or the Choice arm (choice of SOC test or self-administered oral rapid test) (68). The Choice arm had significantly greater odds of testing uptake. Of those in the Choice arm who tested, 26.9% selected the SOC test, 64.6% chose supervised self-testing in the clinic, and 8.5% took a test kit for home use. Therefore, participants varied in the HIV test they selected when given choices (68). In South Africa, MSM were recruited over three phases (different locations) when they were given HIVST kits (72). Still, texting about the availability of HIVST kits increased testing rates from 1.3 to 3.5% in Kenya (69). Furthermore, the sending of short message service (SMS) to participants aided participants in reporting HIVST results in South Africa (75).

Cost/Financial Incentives
Free HIVST kits were preferred compared to kits available to be purchased by male and female regular testers to overcome the financial burden associated with obtaining HTS, a prominent deterrent for linkage to care in several developing sub-Saharan nations (15). Cost (free vs. paid) drove the preference between self-testing and provider administered testing in Kenya (80). In Zimbabwe, participants were provided vouchers to be redeemed for HIVST within 1 month at prices between $0 and $3 at multiple sites (61). A high sensitivity to price for HIVST was realized among men, rural residents, and persons who had never tested for HIV, while reduced-priced or free tests increased HIVST demand (61). Also, in Zimbabwe, the strongest preference for kits was price-every $1 increase in price increased disutility (54). Staff at five pharmacies recruited clients and offered participants HIVST kits for $1 USD in Kenya (76). In one paper, the main theme in the behavioral study was affordability; participants were willing to pay up to 111 Kenyan shillings (Ksh) (around $1.25 USD) for an HIVST kit (41).

HIVST Distribution Strategies
In Uganda, seeds (peer distributors) distributed HIVST kits to men; 82% of men accepted HIVST kits from their peers (63). Community counselors provided HIVST to community members through a community-based model prior to the interviews in Malawi (71). More men than women declined joint HIVST due to fear of their infidelity being exposed (71). In South Africa, MSM were given up to nine test kits, either OF or FS, to use themselves or to provide to their social network (73). In Kenya, 93% of women offered an HIVST to their male partner and of those women, 95% of male partners used a selftest (77). Hospitals were randomly selected from each region of Kenya (67). Thirty-four of surveyed HCWs used the kit on themselves; 73% provided a kit to their partner in Kenya (67). Also in Kenya, staff instructed two arms of women from antenatal and postpartum clinics on how to use OF based rapid HIV tests and provided them multiple test kits; the women were given three test kits each and FSWs were given five test kits each (81). Ninety-one percent of women in antenatal care and 86% in post-partum care distributed HIVST kits to their sexual partners. Seventy-five percent of female sex workers distributed HIVST kits to their clients (81). Secondary distribution of HIVST kits provided by women to their male partners increased the proportion of men who tested, linkage to care, and prevention services if accompanied by financial incentives and reminder calls (64). In Zambia, door-to-door delivery of HIV Testing Services (HTS) was offered to participants and included HIVST (66).
In a three-arm RCT, participants were randomized to either arm one [standard of care (SOC)], arm two (letter of invitation for partner to test), and arm three (letter and instructions on how to use HIVST and two HIVSTs with counseling) in Kenya (74). Men in arm three were twelve times more likely to test when compared to arm one; improved male invitation letter increased the likelihood of male partner testing by twelve times (74). Also, in Kenya, a three-arm RCT of participants randomized to receive either SOC plus standard information card, an information card referencing male HIV testing, or two oral HIVST kits, and HIV testing information (65). In the intervention group (arm 3), 82% of men reported HIV testing as a couple, compared with 28% in arm one and 37% in arm two (65). Uptake of secondary distribution of HIVST was 9.1%, of which, 55.8% of kits were reported to have been used (66).

Miscellaneous Strategies
In Malawi, participants received pre-test counseling, instructions on how to perform HIVST, and were asked to demonstrate their understanding of how to use the kit (25). Participants were also offered self-testing plus confirmatory HTC (parallel testing with two rapid finger-prick blood tests), standard HTC alone, or no testing (62). In Uganda, participants were offered HIVST or standard of care in a cluster randomized HIVST trial; most participants (94.7%) underwent repeat HIVST with a returned 2.1% positivity rate after having used the kits (70) In Uganda, participants were randomized to either an unsupervised HIVST group or a provider supervised HIVST group; unsupervised HIVST able to identify 90% of HIV-infected persons (60).

DISCUSSION
We completed a systematic review to assess published articles regarding HIVST uptake and intervention strategies among men in sub-Saharan Africa. Though more attention and research has been paid to HIVST in recent years, men in sub-Saharan Africa are still not testing at rates consistent with their female counterparts. The intervention strategies found in this review aimed to increase HIV testing for men in some capacity. Novel approaches, such as the targeting of truck drivers who are at high risk of HIV infection at truck stops in Kenya (80) offer the chance of accessing such a hard-to-reach niche group. Still, other strategies have been used successfully as well. In a study ineligible for inclusion in this review, community health counselors have been used to target hard-to-reach populations as well as reported in a recent a study (82). To sustain awareness of the availability of HIVST, counselors consistently sensitized their communities through the distribution of flyers and regular interaction with potential clients (82). Over a 12-month period, counselors achieved over 80% adult uptake of HIVST within their respective cluster (82). Neuman et al. (83) developed a protocol for HIVST to be provided by trained lay distributors selected by the community. Trials evaluated the effectiveness of distribution of HIVST kits by community-based distribution agents on uptake of HIV testing (83). Strategies, such as these are necessary for increasing the uptake of HIVST. There is no one intervention strategy that will work universally for meeting the needs of all men in the sub-Saharan Africa region. It is important that multiple strategies be employed in several locations in order to better locate men and provide what they need to be tested for HIV.
Overall, HIVST was found to be acceptable and when surveyed, most participants reported being willing to either use HIVST kits themselves and/or recommend it to family and friends. Research has provided further evidence of the acceptability of HIVST. A study, not included in this review, found that 96% of participants reported that they would use a self-test if it were available to them and 95.5% would recommend a self-test to their sexual partners (84). Secondary distribution of HIVST kits to men by peers or their partners were highlighted in this review and are advantageous ways to reach some men. These avenues of HIVST kit distribution should continue to be utilized. HIVST kit distribution via female sex workers should also be prioritized. Testing kits should also be provided for free to all users in order to address the barriers of cost that play a role in men not utilizing HIVST.
One of the major findings of this review is that HIVST is deemed to be more convenient than traditional testing. Yet, there were also findings of some men being skeptical of HIVST and were not convinced of the accuracy of the kits (49). There were also issues identified with persons being unable to complete their HIVST without errors (52). These findings suggest that there is a great need for more health information pertaining to HIVST and its benefits as well as its accuracy to be provided in the region. There is also a need for the instructions which accompany each HIVST kit to be reviewed (85) and tested among diverse populations in the region. Pre-test counseling, as mentioned in Choko et al. (25) article, is also worthy of further exploration in order to minimize user error. Overall, HIV counseling in general is still needed and should be provided to men who opt to use HIVST. In the context of self-testing, HIV counseling is necessary for addressing concerns around testing, stressing the importance of confirmatory testing, and achieving linkage to care for those testing positive. HIV counseling may also be completed via SMS or a mobile app in order for testers to report their HIVST results and schedule a convenient date and time for in-depth counseling, receive a confirmatory HIV test, and be linked to care (86). Using home visits or phone, or through a mobile app, HIVST can be better promoted as convenient and efficient. Lastly, as pre-exposure prophylaxis (PrEP) becomes more available in the region, men who engage in risky-sexual behaviors should be provided PrEP to add to the current toolbox of HIV prevention methods.
Further research should investigate the use of HIVST and linkage to care in tandem for men in sub-Saharan Africa. Linking men to care is paramount to reducing HIV incidence in the region. Past research reported some 85% of respondents being willing to link to care following a positive test (86). Respondents also preferred home visits or phone calls to SMS for linking to care (86). Another study reported that linkage to care for participants was estimated to be 56.3% (524/930) (25). Furthermore, it was reported that over 97% of men reported using the HIVST kit at 3-month follow up (87). All participants who tested positive (5.6%) sought a confirmatory test and began HIV treatment (87). Linkage to care was confirmed by participants via 8.7% receiving counseling, 16% initiated ART, and 5.3% CD4-tested (42). Future research should also investigate the use of multiple venues as a means for reaching men in sub-Saharan Africa. Past research has reported uptake of HIVST being high for both the home-based (64.9%) and facility-based groups (52.7%) (88). Significantly, more adults reported positive HIVST results in the home group (6.0%) vs. the facility group, (3.3%) (88).
This systematic review is subject to limitations that should be considered. First, only full-text peer-reviewed articles that were written in English were included. Also, while this review aimed to review published articles pertaining to HIVST uptake and intervention strategies among men in sub-Saharan Africa, articles meeting our criteria included both men and women. Furthermore, country specific names and truncated regional names were not used during the database search; this search strategy may have omitted relevant articles. Study evaluations, and cost analyses were also not included. Articles which fit into the categories may have provided salient strategies for increasing HIVST uptake. One article was omitted due to it not meeting the required age restriction of participants being 16 years or older; the population of interest included participants as young as. Finally, only articles which were published between 2010 and 2020 were included in this review. Still, this review has multiple strengths which is necessary to highlight. First, the various quality assessment tools used for article evaluation ensures that included articles' design, analysis, and reporting has been properly considered and carried out and indicates the quality of included studies. Also, the rigor of the methodology used in this review presents an accurate and comprehensive account of articles pertaining to HIVST uptake and intervention strategies among men in sub-Saharan Africa.

CONCLUSION
HIVST is highly acceptable to men. More efforts are needed to develop policies to implement HIVST programs targeting men in Sub-Saharan Africa, including a focus on linkage to care in sub-Saharan Africa. Future interventions should directly target men independently in tandem with using peers and their romantic partners to promote self-testing among men in sub-Saharan Africa. HIVST kit distribution strategies should be combined with services that can offer confirmatory tests and counseling for men as well as linkage to care. The continuation of implementing health education, promotion, and the offering of HIVST at multiple venues and target areas where men in each country are known to congregate is necessary. Country-specific HIVST intervention strategies and methods are also necessary to achieve the greatest reach. Lastly, PrEP strategies for men in tandem with HIVST should developed and implemented in countries where PrEP is available.

DATA AVAILABILITY STATEMENT
The original contributions presented in the study are included in the article/supplementary material, further inquiries can be directed to the corresponding author/s.

AUTHOR CONTRIBUTIONS
AH and NT completed the data extraction quality assessment, and manual searches for articles. AC, MH, PJ, JK, and DC reviewed, edited, and provided the insight for the development of the manuscript. All authors contributed to the article and approved the submitted version.