TABLE 5.

Immunoglobulin G (IgG) ELISA sensitivity and specificity for detection of antibodies to California serogroup viruses

		IgG ELISA+	IgG ELISA−	Total
PRNT+	JC	18	3	21
	SSH	13	6	19
PRNT−	JC+SSH	0	20	20
Total		31	29	60

Jamestown Canyon (JC) virus IgG ELISA sensitivity: 18 of 21=85.7% (95% CI 63.7 to 97.0). Snowshoe hare (SSH) virus IgG ELISA sensitivity: 13 of 19=68.4% (95% CI 43.5 to 87.4). California serogroup virus: IgG ELISA sensitivity (JC+SSH): 31 of 40=77.5% (95% CI 61.6 to 89.2); IgG ELISA specificity (JC+SSH): 20 of 20=100% (95% CI 83.2 to 100).

− Negative; PRNT Plaque reduction neutralization test;

+ Positive