Abstract
Surface antigens of the avian malarial parasite, Plasmodium lophurae, and its host cell, the duckling erythrocyte, were visualized at the ultrastructural level using rabbit antisera and ferritin-labeled goat anti-rabbit IgG. Rabbit antisera to P. lophurae caused an aggregation of parasite and parasitophorous vacuole surface membrane antigens, a phenomenon known as capping. Capping required living plasmodia and did not occur if parasites had been fixed with glutaraldehyde prior to exposure to antisera. Antisera against duckling erythrocytes did not cross-react with erythrocyte-free malarial parasites, and did not form caps on the surface of the red blood cell. Antiplasmodial sera did not react with normal or malaria-infected red cells. These results suggest that surface membrane proteins of the intracellular plasmodium are capable of lateral movement.
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