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Wright-stained peripheral blood smear from patient A (index case-patient), a renal transplant recipient infected with Babesia microti parasites, Wisconsin, USA, 2008. The smear shows intraerythrocytic Babesia parasites, a ring form (black arrow), and a Maltese cross or tetrad form (red arrow), which is pathognomonic for babesiosis. Scale bar indicates 10 μm.
