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Daily mean (SE) cycle threshold (Ct) values for the detection of avian influenza virus by real-time quantitative reverse transcription-PCR 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).
