I am sure a search of the literature would document transfusion
induced toxoplasmosis in humans. Toxoplasma gondii can easily be
isolated from the blood of experimentally infected animals during
acute infection. However, I do not believe that blood is examined
for Toxoplasma gondii. If a donor is suffering from an acute
infection then antibodies might not be present (i.e. to early to
detect IgM). A PCR test using B1 gene might detect T. gondii but
would be to expensive. Just screening blood for IgG antibodies
would result in about 30% positive but would be of little value
because chronic infections (infections with no parasitemia) would
be
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