Molecular survey for foot-and-mouth disease virus in livestock in Tanzania, 2008-2013

Onderstepoort J Vet Res. 2014 Apr 23;81(2):E1-6. doi: 10.4102/ojvr.v81i2.736.

Abstract

Phylogeography data are of paramount importance in studying the molecular epidemiology dynamics of foot-and-mouth disease virus (FMDV). In this study, epithelial samples and oesophageal-pharyngeal fluids were collected from 361 convalescent animals (cattle and buffaloes) in the field throughout Tanzania between 2009 and 2013. The single plex real-time RT-PCR (qRT-PCR) assay for rapid and accurate diagnosis of FMDV employing the Callahan 3DF-2, 3DF-R primers and Callahan 3DP-1 probe were used. Preparation of the samples was performed according to the OIE manual, with a Kenya O serotype obtained from the attenuated vaccine serving as a positive control and samples collected from healthy animals serving as true negatives. The results indicated that 53.49% of samples (n = 176) were positive for FMDV genome by qRT-PCR, with Ct values ranging from 14 to 32. In addition, molecular typing of the FMDV genome positive samples using serotype specific primers revealed the existence of several serotypes: serotype South Africa Territory 1 (SAT1) (34.25%, n = 60), serotype A (68.92%, n = 98), serotype O (59.20%, n = 98) and SAT2 (54.54%, n = 96). The virus protein 1 sequences analysis for 35 samples was performed and the collective results indicated: 54.28% serotype O, 25.71% serotype A, 14.28% serotype SAT1 and 2.85% serotype SAT2. Therefore in this study, both the phylogenetic trees and spatial distribution of serotypes elucidated the phylodynamics of multiple FMDV field strains in Tanzania and neighbouring countries.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Buffaloes / virology*
  • Cattle
  • Cattle Diseases / epidemiology
  • Cattle Diseases / virology*
  • Foot-and-Mouth Disease / epidemiology
  • Foot-and-Mouth Disease / virology*
  • Foot-and-Mouth Disease Virus / classification
  • Foot-and-Mouth Disease Virus / genetics*
  • Phylogeny
  • Real-Time Polymerase Chain Reaction / veterinary
  • Reverse Transcriptase Polymerase Chain Reaction
  • Serogroup
  • Tanzania / epidemiology