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Microsc Res Tech. 2021 Dec 09; doi: 10.1002/jemt.24019. Epub 2021 Dec 09.

Histological technique to detect the physiological age of the malaria vector mosquito Anopheles pharoensis (Diptera: Culicidae).

Microscopy research and technique

Abeer S Yamany, Fathy Abdel-Ghaffar, Saleh Al Quraishy, Ohoud Al-Amri, Heinz Mehlhorn, Rewaida Abdel-Gaber

Affiliations

  1. Department of Zoology, Faculty of Science, Zagazig University, Zagazig, Egypt.
  2. Department of Biology, University College, Hafr Al-Batin University, Saudi Arabia.
  3. Zoology Department, Faculty of Science, Cairo University, Cairo, Egypt.
  4. Zoology Department, College of Science, King Saud University, Riyadh, Saudi Arabia.
  5. Parasitology Institute, Düsseldorf University, Düsseldorf, Germany.

PMID: 34883537 DOI: 10.1002/jemt.24019

Abstract

The risk of malaria recurrence increases due to the main vector, Anopheles pharoensis. The physiological age of the mosquito population is needed to expect malaria vector dynamics. The number of completed gonotrophic cycles is of great importance in determining the physiological age of females. A technique has been described that focuses on the number of dilatations remaining in the ovarioles after each oviposition to determine how many blood meals have been taken. At each gonotrophic cycle, the chances of infection of the vectors are repeated. The histological changes that occur immediately in the ovarioles and ovulation itself were studied. Under the influence of the contractions of the ovarian muscles, the eggs begin to move over the distal end of the ovariole into the inner oviduct. The terminal pedicle is markedly dilated near the diameter of the eggs. After the expulsion of the mature eggs, ovariole dilations were found at the point of their development in the terminal pedicle due to the accumulation of nurse cell remnants and follicular epithelium. The results were used to develop epidemiological localization and to evaluate the effectiveness of antimalaria interventions. The ovarian inspection often provides a technique to distinguish nulliparous from parous female anophelines. In addition, this study can provide basic entomological knowledge on the physiological age of mosquitoes by considering the histological changes in the ovaries, which allow the evaluation of vector management strategies in the field.

© 2021 Wiley Periodicals LLC.

Keywords: Anopheles pharoensis; histological technique; malaria vector; physiological age

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