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Front. Vet. Sci. | doi: 10.3389/fvets.2018.00320

Molecular Epidemiology of Foot-and-Mouth Disease Virus in the Context of Transboundary Animal Movement in the Far North Region of Cameroon

 Miranda R. Bertram1, 2, Carla Bravo de Rueda1, 2, Rebecca Garabed3, Simon Dickmu Jumbo4, Mark Moritz3, Steven Pauszek2, Souley Abdoulkadiri4,  Luis L. Rodriguez2* and  Jonathan Arzt2
  • 1Oak Ridge Institute for Science and Education (ORISE), United States
  • 2Plum Island Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, United States
  • 3The Ohio State University, United States
  • 4Laboratoire National Vétérinaire du Cameroun (LANAVET), Cameroon

Transboundary movement of animals is an important mechanism for foot-and-mouth disease virus (FMDV) spread in endemic regions, such as Cameroon. Several transboundary animal trade routes cross the Far North Region of Cameroon, and cattle moved on foot along these routes often come in contact with native (sedentary and transhumant) herds. The purpose of this study was to investigate the role of transboundary trade cattle in the epidemiology of FMDV in the Far North Region of Cameroon. A total of 582 oropharyngeal fluid (OPF) samples were collected from asymptomatic transboundary trade cattle at official border check points and 57 vesicle epithelial tissues were collected from clinically affected native cattle in the Far North Region of Cameroon during 2010-2014. Viral protein 1 (VP1) coding sequences were obtained from 6 OPF samples from transboundary cattle (4 serotype O, 2 serotype SAT2) and 19 epithelial tissue samples from native cattle (7 serotype O, 3 serotype SAT2, 9 serotype A). FMDV serotype O viruses belonged to two topotypes (East Africa-3 and West Africa), and phylogenetic analyses suggested a pattern of continuous transmission in the region. Serotype SAT2 viruses belonged to a single topotype (VII), and phylogenetic analysis suggested a pattern of repeated introductions of different SAT2 lineages in the region. Serotype A viruses belonged to topotype AFRICA/G-IV, and the pattern of transmission was unclear. Spearman rank correlation analysis of VP1 coding sequences obtained in this study from transboundary and native cattle showed a positive correlation between genetic distance and time for serotype O (rho=0.71, p-value=0.003) and between genetic distance and geographic distance for serotype SAT2 (rho=0.54, p-value=0.1). These data suggest that transboundary trade cattle participate in the transmission of FMDV in the Far North Region of Cameroon, however the dynamics and direction of transmission could not be determined in this study. Results of this study contribute to the understanding of transboundary FMDV epidemiology in Central Africa and will help to inform control programs in Cameroon and in the region.

Keywords: transboundary, Cattle, FMDV (foot-and-mouth disease virus), Cameroon, Epidemiogy

Received: 24 Aug 2018; Accepted: 30 Nov 2018.

Edited by:

Lester J. Perez, Faculty of Medicine, Dalhousie University, Canada

Reviewed by:

Yichao Yang, University of Arkansas, United States
Victoriya Volkova, Kansas State University, United States  

Copyright: © 2018 Bertram, Bravo de Rueda, Garabed, Dickmu Jumbo, Moritz, Pauszek, Abdoulkadiri, Rodriguez and Arzt. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Luis L. Rodriguez, Plum Island Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, Greenport, NY 11944, New York, United States, Luis.Rodriguez@ARS.USDA.GOV