Average cycle threshold (Ct) score differences, standard errors and P-values for T-tests conducted on RT-PCR results for several bird species.

Comparisons between: oral swab samples on FTA™ or RNASound™ cards, kidney tissue, oral swabs (American crows) and local agency (oral swab or brain) testing (all tested by RT-PCR). Trial II, July-August, 2013, California. Bolded test methods indicate the higher (therefore lower viral RNA detected) scores in each pair. All analyses were conducted by the UC Davis Arbovirus Research and Training Laboratory, except where local agency testing is indicated. N = 48 birds were tested by the various test methods.