Average cycle threshold (Ct) score differences, standard errors, and P-values for T-tests conducted on RT-PCR results from West Nile virus testing of dead corvids.

Comparisons between: oral samples on FTA™ cards, kidney tissue, and oral swab (American crows) analyses. Trial I, June-August 2012, California. Underlined test methods indicate the higher (therefore less viral RNA detected) scores in each pair. Ct scores were available for n = 24 of the 55 birds tested.