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Babesia divergens-like infection, Washington State.
1: Emerg Infect Dis. 2004 Apr;10(4):622-9.
Babesia divergens-like infection, Washington State.
Herwaldt BL, de Bruyn G, Pieniazek NJ, Homer M, Lofy KH, Slemenda SB,
Fritsche TR, Persing DH, Limaye AP.
Centers for Disease Control and Prevention, Atlanta, Georgia, USA.
Most reported U.S. zoonotic cases of babesiosis have occurred in the
Northeast and been caused by Babesia microti. In Washington State, three
cases of babesiosis have been reported previously, which were caused by WA1
(for "Washington 1")-type parasites. We investigated a case of babesiosis in
Washington in an 82-year-old man whose spleen had been removed and whose
parasitemia level was 41.4%. The complete 18S ribosomal RNA gene of the
parasite was amplified from specimens of his whole blood by polymerase chain
reaction. Phylogenetic analysis showed the parasite is most closely related,
but not identical, to B. divergens (similarity score, 99.5%), a bovine
parasite in Europe. By indirect fluorescent-antibody testing, his serum
reacted to B. divergens but not to B. microti or WA1 antigens. This case
demonstrates that babesiosis can be caused by novel parasites detectable by
manual examination of blood smears but not by serologic or molecular testing
for B. microti or WA1-type parasites.
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