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Volume 15, Number 5—May 2009


Babesiosis Acquired through Blood Transfusion, California, USA

Van NgoComments to Author  and Rachel Civen
Author affiliations: Los Angeles County Department of Public Health, Los Angeles, CA, USA

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Results of serologic testing and PCR analyses of specimens collected from a California resident with babesiosis and donors of packed red blood cells, 2007*

Specimen source Residence Date of transfusion† Date of specimen collection B. microti test results
Patient California Feb 12 Positive <8‡
Feb 20 64
Donor 1 Maine Jan 1 Feb 26 Negative 256
Donor 2 Maine Jan 1 Feb 26 <8
Donor 3 California Jan 22 Feb 21 <8
Donor 4 California Jan 23 Feb 22 <8
Donor 5 California Jan 24 Feb 21 <8
Donor 6 California Jan 24 Feb 21 <8

*IFA, immunofluorescent antibody.
†Involving blood products from specified donor.
<8 is considered a negative titer for total B. microti antibody. IFA tests conducted at the Centers for Disease Control and Prevention Reference Diagnostic Laboratory.

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