estimated that 16 to 18 million people have chronic T. cruzi infection.
transmission also occurs via blood transfusions.
United States:
50 to 100,000 immigrants with T. cruzi infection may be living in the USA.
only 3 cases have been described in which acute Chaga's disease has resulted from transmission of the parasite by a vector.
there is the risk of transmission via infected blood transfusions. At present the Food and Drug Administration has not licenced an assay for use in blood banks.
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