Table 2.

Alphavirus plaque reduction neutralization test results.

Sample Characteristics	n	CHIKV and ONNV Positive	CHIKV Positive	ONNV Positive	SINV Positive	Positive for Any Alphavirus	Negative
CHIKV IgG positive (IFA)	31	12 (39%)	0 (0%)	13 (42%)	0 (0%)	25 (81%)	6 (19%)
CHIKV IgM positive (ELISA)	23	0 (0%)	1 (4%)	0 (0%)	0 (0%)	1 (4%)	22 (96%)
Both CHIKV IgG and IgM positive	4	2 (50%)	0 (0%)	1 (25%)	0 (0%)	3 (75%)	1 (25%)
Negative	11	0 (0%)	0 (0%)	1 (9%)	0 (0%)	1 (9%)	10 (91%)
TOTAL	69	14 (20%)	1 (1%)	15 (22%)	0 (0%)	30 (43%)	39 (57%)