First Findings of Duck Circovirus in Migrating Wild Ducks in China

Vet Microbiol. 2018 Mar;216:67-71. doi: 10.1016/j.vetmic.2018.02.007. Epub 2018 Feb 6.

Abstract

To probe the epidemiology of duck circovirus (DuCV) in migrating wild ducks in China, 189 samples collected from 11 species of wild ducks from 2013 to 2016 were analyzed by PCR. Four positive samples were obtained from Mallard (2), Green-winged Teal (1), and Falcated Duck (1), and the positive rate was 2.12%. The homologous alignment of the complete genome shows that the homology of the wild duck strains is 81.6 to 95.1% to each other and 81.4 to 100% to the 32 strains from other origins. Amino acids alignment revealed that the mutable ORF2 gene has six major variable regions and many random mutation points. Phylogenetic analysis showed that the four sequences belong to two genotypes: wd2013017, wd2013046 and AY228555 (representative strain of genotype 1) belong to genotype 1, while wd2014012, wd2015028 and AY394721 (representative strain of genotype 2) belong to genotype 2. The results indicate that both genotypes of DuCV are distributed and common in migrating wild ducks. Further analysis shows that duck circovirus infection is mainly concentrated in the eastern coastal cities of China, which are part of the East Asian-Australian flyway. This suggests that wild ducks with circovirus may be an important factor in the epidemic and spread of DuCV.

Keywords: Duck circovirus; Epidemiology; Wild ducks.

MeSH terms

  • Animal Migration
  • Animals
  • Animals, Domestic / virology
  • Animals, Wild / virology
  • Australia / epidemiology
  • China / epidemiology
  • Circoviridae Infections / epidemiology
  • Circoviridae Infections / transmission
  • Circoviridae Infections / veterinary*
  • Circoviridae Infections / virology
  • Circovirus / genetics
  • Circovirus / isolation & purification*
  • DNA, Viral / genetics
  • Genome, Viral
  • Genotype
  • Phylogeny
  • Polymerase Chain Reaction
  • Poultry Diseases / epidemiology*
  • Poultry Diseases / transmission
  • Poultry Diseases / virology

Substances

  • DNA, Viral

Supplementary concepts

  • Duck circovirus