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Daily mean (SE) infectious titers for the detection of avian influenza virus by viral titration in excrement samples and cloacal swabs collected from five Mallards (Anas platyrhynchos) after experimental infection with avian influenza virus. Excrement samples were collected twice (9:00 AM and 4:00 PM) on most days, while cloacal swabs were collected once per day (9:00 AM). Viral titers are reported in log10 EID50/mL (cloacal swabs) or per gram (excrement samples).
