# Ct refers to the crossing threshold value in Real time PCR. Typically a value >40 is negative, and Ct values < 36-40 are positive (this value can vary depending on the test).
NT Not tested
Red Also Positive in AIV PCR test
Table 4: Virulent/avirulent APMV-1 qPCR and nested Virulent/avirulent APMV-1 qPCR results for a set of control samples positive in the Wise/Kim qPCR test used to pre-screen the samples for the presence of APMV-1.