Why might an ELISA and IFA have discordant test results for the same serum samples and antigens?

I am developing an ELISA for Porcine Epidemic Diarrhea Virus (PEDV). I have in-house PEDV controls that agree on both ELISA and IFA. However, when testing cross-reactivity, Porcine Respiratory...

10 January 2015 3,639 6 View