Key to West Nile cases

Case A

ELISA results:

PCR results:

3 of the 10 blood samples (numbers 2, 5, and 8) test positive for antibodies to WNV by ELISA.
Only sample 5 tests positive for WNV cDNA

Case B

ELISA results, testing for West Nile virus proteins:

ELISA results, testing for antibodies to West Nile virus:

Interpretation of results:

All 6 of the bird samples test positive for WNV protein.
Rachel's husband tests positive for WNV antibodies, but she and both of her children are negative.