The Japanese Journal of Veterinary Science
Online ISSN : 1881-1442
Print ISSN : 0021-5295
ISSN-L : 0021-5295
Intraerythrocytic Schizogony of Theileria sergenti in Cattle
Satoshi KAWAMOTOKiyoshi TAKAHASHITakashi KUROSAWAMitsuo SONODAMisao ONUMA
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1990 Volume 52 Issue 6 Pages 1251-1259

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Abstract

The characteristics of developing intraerythrocytic stages of T. sergenti were studied by light and transmission electron microscopy. The parasites with many ribosomes, acristate mitochondria, cytostome, and food vacuoles were morphologically regarded as the trophozoite stage. Although this type of parasites was frequently detected, intraerythrocytic merozoite stage with electron dense cisternae, rhoptries and small electron dense bodies was rarely observed in high parasitaemia. The intraerythrocytic stages of T. sergenti were divided mainly into four daughters by schizogony, and alternatively into two by binary fission. The daughter parasites in each division had the same ultrastructural features as of merozoites. As a result, it was suggested that T. sergenti trophozoites multiplied by schizogony to four organisms or by binary fission in the peripheral erythrocyte, and differentiated to the merozoites which acquired penetrating ability into the erythrocytes.

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