Table 1.

Relationship between IF assay titer and ELISA sensitivity

IF titer	No. of serum samples tested	Sensitivity (%)
IF titer	No. of serum samples tested	GRA7	Tg34AR	GRA7-Tg34AR^a
1/1,024	19	100	100	100
1/256	47	83	91	96
1/64	29	65	76	93

↵a Combination of GRA7 and Tg34AR as described in Materials and Methods.