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. 2013 Mar 13;8(3):e58534. doi: 10.1371/journal.pone.0058534

Figure 3. A–B. Longitudinal surveillance effort and AIV prevalence and subtype data in the two main species groups.

Figure 3

Number of individual ducks (A) and gulls (B) sampled, the percentage of AIV positive birds and the subtype isolated during the study period January 2010–November 2011.