CD79A and infection: The specificity of the indirect competitive inhibition ELISA was 88.0%, because three samples out of 25 rRT-PCR negative samples had a positive test (Table 1); the discrepant results for the three samples can be attributed to the fact that the ELISA conjugate is a commercial HRP-conjugated goat anti-rat secondary antibody that may cross-react with IgA antibodies in NPA taken early in the infection.