Biological and Histological Studies on Tick-Borrelia Interaction During Reproduction and Transovarial Transmission of B. Crocidurae in Female Ornithodoros erraticus

Articles in Press

Document Type : Original Article

Authors

1 Entomology, , Ain Shams University, faculty of scienceCairo, Egypt

2 Entomology department, AINSHAMS University, faculty of science

Abstract

Borrelia crocidurae infection of female Ornithodoros erraticus reduced the fecundity and fertility of the infected female tick, decreasing its egg production and viability.   Microscopic examination of the semithin sections of the infected female ovary revealed five developmental stages of the oocyte as in the uninfected female. However, in the infected females, Borrelia spirochetes were apparently transported to the ovary via its surrounding hemolymph (HL) to invade oocytes during all their stages of development. The borrelial spirochetes were localized adhering to and directly penetrating oocytes of the early stages ɪ and ɪɪ having no chorion and protruding into HL. Also, B. spirochetes penetrated the ovary epithelial wall to be localized inside the pedicels then moved to enter the ovary lumen and attached oocytes including those not fully chorionated such as the vitellogenic oocyte stage ɪɪɪ. Borrelia spirochetes seemed to pass through the unchorionated points of oocytes contact with pedicels to spread throughout the developing oocytes. Borrelia spirochetes were detected adhering to and inside the closely packed large yolk granules in the mature oocyte stage V. The noticeable disappearance of chorion in some infected ovulating oocyte stage V subjected them to penetration and further invasion by B. spirochetes which have entered the ovary lumen.

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Egyptian Journal of Veterinary Sciences

Articles in Press, Corrected Proof
Available Online from 08 January 2025

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History

  • Receive Date: 08 November 2024
  • Revise Date: 19 December 2024
  • Accept Date: 19 December 2024

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