Effect of extrinsic incubation temperature on transstadial and transovarial transmission of Borrelia sp. in Ornithodoros (O.) savignyi and infectivity to vertebrate host. | ||
| Egyptian Academic Journal of Biological Sciences, E. Medical Entomology & Parasitology | ||
| Article 3, Volume 1, Issue 1, December 2009, Pages 21-29 PDF (194.79 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/eajbse.2009.16460 | ||
| Authors | ||
| Nawal M. Shanbaky1; Nadia Helmy1; Adel Abd Elmohsen2; Amira E. Abd-Elhamid1 | ||
| 1Department of Entomology, Faculty of Science, Ain-Shams University | ||
| 2Research and Training Center on Vectors of Diseases, Ain-Shams University | ||
| Abstract | ||
| Effects of three extrinsic incubation (EI) temperatures on vector competence of Ornithodoros savignyi to Borrelia sp. isolated from a natural population of the tick in Egypt were investigated. The EI temperature influenced the efficiency of Borrelia sp. transmission by the female O. savignyi to hamsters. An EI temperature for 27oC was optimum for successful transmission of Borrelia sp. where the highest infection rates (IRs) in hamsters occurred. Generally, the IRs in hamsters decreased by lowering the EI temperature to 17oC or rising it to 37oC in each of the corresponding experimental cases (number and postinfection period of the tick feeding per hamster) tested. Ornithodoros savignyi kept at 27oC and 37oC maintained borrelial infection transstadially from nymph 1 to 7 and adults. The transstadially infected stages transmitted the spirochetes to hamsters with higher IRs at 27oC than 37oC. Transovarial transmission of Borrelia sp. occurred during the first and second (at higher rates) gonadotrophic cycle in the infected female ticks kept at 27oC and 37oC. However, no molting or oviposition occurred at 17oC. | ||
| Keywords | ||
| Temperature; Borrelia; Ornithodoros; vertebrate | ||
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