Published in Medical Letter on the CDC and FDA, June 1st, 2003
According to a study from Japan, "A total of 1335 archived human sera collected in 1985 from an area in Japan where a tick-borne disease is endemic were examined by indirect immunofluorescence antibody test (IFAT) to estimate seroprevalence against 3 serologically distinct types of Babesia microti-like parasites; namely, Hobetsu, Kobe, and U.S. types.
"Eighteen sera (1.3%) were found to be IFAT-positive (titer 1:100-1:6,400), of which 14 and 3 sera were ascertained by Western blot analysis to be positive...
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