TABLE 2.

Profile of repeatedly reactive samples

Sample type	Architect test (S/CO)			IFA test
	Initial	Repeat reactive 1	Repeat reactive 2	Titer	Interpretationa
Plasma	35.6	36.2	36.2	1:128	Positive
	37.7	38.2	40.1	1:64	Positive
	36.6	39.4	37.9	<1:64	Negative
	12.7	12.9	13.5	<1:64	Negative
	1.6	1.5	1.5	<1:64	Negative
Serum	13.5	14.4	14.4	<1:64	Negative
	2.2	2.2	2.2	<1:64	Negative

^aAn IFA titer of ≥1:64 is considered positive.