TABLE 3.

Dilutional sensitivity of prototype anti-Babesia assay and IFA test

Sample no.	Final endpoint titera
	Architect assay	IFA test
1	1:80	<1:64
2	1:320	<1:64
3	1:5,120	1:512
4	1:640	1:128
5b	Negative	<1:64
6	1:1,280	1:512
7	1:160	<1:64
8	1:40	<1:64
9	1:2,560	1:512

^aEach sample comprises a pool of IFA-reactive donors. For the anti-Babesia assay, the dilution shown is the last value to be considered positive in the assay (S/CO of >1.0). For samples detected by IFA, the titer indicated is the endpoint titer, and samples with titers of <1:64 are considered negative.

^bSample 5 was a negative control.