Volume 16, Number 12—December 2010
Perspective
Surveillance of Wild Birds for Avian Influenza Virus
Figure 3

Figure 3. Probability of detecting >1 individual bird infected with avian influenza virus from a given number of samples selected at random from an extremely large population in which individual birds are infected at random at different prevalence levels. Although this nominal minimum detectable prevalence assumes binomial sampling, it can also be used for gaining a rough quantitative estimate of the minimum number of samples required before embarking on a surveillance program.
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