Complete genome and molecular epidemiological data infer the maintenance of rabies among kudu (Tragelaphus strepsiceros) in Namibia

PLoS One. 2013;8(3):e58739. doi: 10.1371/journal.pone.0058739. Epub 2013 Mar 20.

Abstract

Rabies in kudu is unique to Namibia and two major peaks in the epizootic have occurred since it was first noted in 1977. Due to the large numbers of kudu that were affected, it was suspected that horizontal transmission of rabies occurs among kudu and that rabies was being maintained independently within the Namibian kudu population - separate from canid cycles, despite geographic overlap. In this study, it was our aim to show, through phylogenetic analyses, that rabies was being maintained independently within the Namibian kudu population. We also tested, through complete genome sequencing of four rabies virus isolates from jackal and kudu, whether specific mutations occurred in the virus genome due to host adaptation. We found the separate grouping of all rabies isolates from kudu to those of any other canid species in Namibia, suggesting that rabies was being maintained independently in kudu. Additionally, we noted several mutations unique to isolates from kudu, suggesting that these mutations may be due to the adaptation of rabies to a new host. In conclusion, we show clear evidence that rabies is being maintained independently in the Namibian kudu population - a unique phenomenon with ecological and economic impacts.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Genetic Variation
  • Genome, Viral
  • Jackals / virology
  • Molecular Epidemiology
  • Mutation
  • Namibia / epidemiology
  • Phylogeny
  • Rabies / epidemiology
  • Rabies / veterinary*
  • Rabies / virology
  • Rabies virus / genetics*
  • Rabies virus / isolation & purification
  • Ruminants / virology*
  • Viral Proteins / genetics

Substances

  • Viral Proteins

Grants and funding

TS, WM and LHN would like to thank the National Research Foundation for funding. MF, BH, CF, DH and TM would like to thank the German federal ministry for education and research (BMBF, grant 01KI1016A) for funding. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.