Volume 13, Number 3—March 2007
Research
Surveillance of Influenza Virus A in Migratory Waterfowl in Northern Europe
Figure 5
![Mean influenza A virus prevalence in the 4 age classes. Birds that we were unable to age correctly were denoted as unaged. Bars indicate standard error.](/eid/images/06-1130-F5.jpg)
Figure 5. Mean influenza A virus prevalence in the 4 age classes. Birds that we were unable to age correctly were denoted as unaged. Bars indicate standard error.
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