Mean AIV titers by quantitative real-time RT-PCR for each swab construction type by day post inoculation and transport media: a) brain heart infusion (BHI), b) phosphate buffered saline (PBS). Statistical significance (p ≤ 0.05) in differences among the amount of virus recovered by swab construction type 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