Volume 16, Number 12—December 2010
Perspective
Surveillance of Wild Birds for Avian Influenza Virus
Figure 2

Figure 2. Proportion of wild mallards (Anas platyrhynchos), Eurasian wigeons (Anas penelope), and white-fronted geese (Anser albifrons) positive for low-pathogenicity avian influenza virus when sampled in the cloaca (C) and the oropharynx (O), the Netherlands, September 2006–March 2009.