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Development of Babesia ovata in the midgut of the tick, Haemaphysalis longicornis.

1989; Japanese Society of Veterinary Science; Volume: 51; Issue: 6 Linguagem: Inglês

10.1292/jvms1939.51.1129

1881-1442

Seiichi Higuchi, Kazuhiko EZURA, M Hamana, Seiichi Kawamura, Yoshio Yasuda,

Agricultural pest management studies

Studies were made on the development of Babesia ovata in the midgut of the nymphal tick vector, Haemaphysalis longicornis. In 12 hr post-repletion, merozoites were observed outside of erythrocytes infected with B. ovata in the contents of the midgut of the tick. After that, these merozoites were transformed into ring-forms which were comparatively large ring 2-3μm in diameter. Within 48-72 hr post-repletion, ring-form protozoa developed into spherical form 4/5μm in diameter. Within 3-4 days post-repletion, fission-forms were transformed into fission-bodies 2-3μm in diameter. Within 4-6 days post-repletion, fission-bodies developed into bizarre-forms 6-7μm in diameter. At this time, elongated form protozoa which were considered as microgametes, 6-8μm in length, are also seen. Within 6-8 days post-repletion, round-formed protozoa which were considered as zygotes in 9-10μm in diameter were observed in the gut. About 10 days after repletion, those round-formed protozoa were transformed into vermicule-formed and round-formed protozoa, 13-15μm in length, appeared again in the gut epithelial cells.