Viral excretion.

<p>IAV was detected by RRT-PCR of the matrix gene from daily fecal samples. The Y-axis displays cycle threshold (CT) values as a quantitative measure of viral excretion. Samples with CT values ≥ 45 were considered negative. The X-axis displays which days of the experiment samples were collected from the Mallards. G1 = two birds in each of three experiments (n = 6), etc. G1 and G2 were OC exposed, G3 was OC exposed day 0–2, and G4 and G5 were unexposed. Value points display mean CT values of 6 samples and error bars display standard errors of the mean (SEM). No significant difference in excretion was detected between drug-exposed (G1 and G2 with resistant genotype NA-292K) and unexposed (G4 and G5 with wild type genotype NA-292R) birds day 1, 4 or 5, while drug-exposed birds had lower virus excretion levels day 2 and 3(<i>P</i> = 0.034).