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Body weights of the ABV4-inoculated and sham-inoculated cockatiels during the study period. The ABV4-inoculated birds (cockatiels 1–3), are shown in bald lines with solid symbols. Cockatiels 4,5 are the control birds; "*" marks the first observation of undigested seeds in the feces; "#" marks the first detection of ABV4 RNA in a choanal or cloacal swab by RT-PCR. Note the continuous decrease in BW of cockatiels 1 and 3 starting on day 21 PI and 31 PI, respectively.
