TABLE 1.

Comparison of EIAs for the detection of WNV IgM antibodies in the serum of experimentally infected monkeys^a

Monkey	Day monkey was identified as WNV IgM positive by:
	COS-1 cell-based assay		S2 cell-based assay
	First	Last	First	Last
J840	12	28	13b	21
R470	11	45	11	45
T810	10c	63	10	63
P469	9	63	9	63
P659	9	45	10	28

^aSerum samples were collected on days 0, 1 to 14, 21, 28, 45, and 63 postinfection. All animals were euthanized on day 63 postinfection except for monkey R470, which was euthanized on day 45.

^bFor monkey J840, the S/N ratio as determined by the S2 assay for the sample obtained on day 12 was 4.10, and the cutoff S/N ratio was 4.20.

^cFor monkey T810, the sample obtained on day 12 was WNV RNA positive as determined by reverse transcription-PCR (15).