Mean AIV titers by quantitative real-time RT-PCR for a single swab or pools of 5 or 11 swabs. Statistical significance (p ≤ 0.05) in differences among the amount of virus recovered by numbers of swabs pooled for each day post inoculation is indicated by different letters above the bars. Error bars represent standard deviation.
Spackman et al. BMC Veterinary Research 2013 9:35 doi:10.1186/1746-6148-9-35