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Immunohistochemistry of placenta from a stillborn fetus after placental monkeypox infection and intrauterine transmission, Democratic Republic of the Congo, 2008. Microscopic findings show diffuse and intense positive staining for orthopoxvirus antigen in Hofbauer cells in the chorionic villi. Immunohistochemistry with antibody to vaccinIa virus counterstained with hematoxylin and eosin. Original magnification ×10.
