Table. Results of serologic testing, polymerase chain reaction analyses, and hamster injection for specimens from the case-patient with babesiosis and the implicated blood donor^a.

Date of specimen	Timing of specimen	Test	Result of testing
Case-patient
September 21, 2000	Pretransplant	Babesia microti IFA	<1:8b
November 14, 2000	Posttransplant	B. microti IFA	1:1024
November 14, 2000	Posttransplant	B. microti PCR	Positive
September 21, 2000	Pretransplant	Agent of HGE, IgMc	Negative
November 14, 000	Posttransplant	Agent of HGE, IgM	Negative
September 21, 2000	Pretransplant	Agent of HGE, IgG	Negative
November 14, 2000	Posttransplant	Agent of HGE, IgG	Negative
September 21, 2000	Pretransplant	Ehrlichia chaffeensis IFA	Negative
November 14, 2000	Posttransplant	E. chaffeensis IFA	Negative
September 21, 2000	Pretransplant	Lyme ELFA	Negative
November 14,2000	Posttransplant	Lyme ELFA	Negative
Implicated blood donor (tested approximately 5 months after donation)
February 28, 2001	Postdonation	Babesia microti IFA	1:256
February 28, 2001	Postdonation	B. microti PCR	Negative
February 28, 2001	Postdonation	Hamster inoculationd	Negative

^aIFA, indirect fluorescent antibody; PCR, polymerase chain reaction; HGE, human granulocytic ehrlichiosis; Ig, immunoglobulin; ELFA, enzyme-linked fluorescence assay. 
^bBabesia microti IFA≤ 1:8=negative.
^cIgM and IgG immunoblots for HGE.
^dTwo hamsters were each inoculated intraperitoneally on April 3 with 0.75 mL of blood obtained on
February 28. Giemsa-stained smears were made from hamster blood obtained twice weekly, for 8
weeks, by tail snip. The hamsters did not become demonstrably parasitemic