Babesia caballi cultured continuously in equine erythrocytes was examined by transmission
electron microscopy. The use of cultured B. caballi permitted examination of a large number
of parasitized cells with various stages of intra erythrocytic development. The piriform
merozoites of B. caballi were composed of an outer membrane and an inner double-
membrane complex. Numerous micronemes and three rhoptries were found in the pellicle of
the merozoite, and a spherical body was seen in the anterior part of the merozoite which�…

In-vitro-propagated Babesiacaballi parasites were examined by scanning and transmission
electron microscopy. Many small pores were observed over the entire surface of infected
erythrocytes on scanning electron microscopy, and on transmission electron microscopy
these small pores were found to be openings of tubular structures. By the examination of a
number of infected cells the tubular structures were found to be connected with the parasite,
and this observation might indicate that the tubular structures arose from the edge of the�…