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The prevalence of avian influenza virus (with standard error bars) in dabbling ducks from Alaska and California according to (a) sampling year and (b) sampling site (significant differences between species at each location are indicated by nonmatching letters). AGWT, American green-winged teal; AMWI, American wigeon; MALL, mallard; NOPI, northern pintail; NSHO, northern shoveler.
