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Related Experiment Videos

Leishmania-sandfly interactions: an empirical field study.

B Yuval1

  • 1Department of Parasitology, Hebrew University Medical School, Jerusalem, Israel.

The Journal of Parasitology
|April 1, 1991
PubMed
Summary
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Female Phlebotomus papatasi sandflies in the Jordan Valley are infected with Leishmania major. Infections do not appear to impact sandfly survival rates, with parasite numbers increasing over time.

Area of Science:

  • Medical Entomology
  • Parasitology
  • Zoonotic Disease Ecology

Background:

  • Phlebotomus papatasi is the primary vector for Leishmania major, the causative agent of zoonotic cutaneous leishmaniasis.
  • The Jordan Valley represents an active focus for this zoonotic disease, necessitating detailed understanding of vector-parasite dynamics.

Purpose of the Study:

  • To characterize the relationship between Phlebotomus papatasi sandflies and Leishmania major in a Jordanian zoonotic focus.
  • To establish the seasonality and intensity of Leishmania major promastigote infection rates in female sandflies.
  • To determine the influence of sandfly developmental stage on infection prevalence and intensity.

Main Methods:

  • Sandflies were collected using 153 trap-nights.
  • 641 female Phlebotomus papatasi were examined for Leishmania major promastigote infections.

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  • Infection rates were analyzed in relation to the gonotrophic age and developmental stage (parous vs. gravid) of the sandflies.

    • Main Results:

    • A total of 48 (7.4%) female Phlebotomus papatasi were infected with Leishmania major promastigotes.
    • Initial infections were generally light, with parasite numbers increasing as infections progressed within the vector.
    • Infection rates were similar between parous and gravid sandflies, suggesting no significant impact on survival.

    Conclusions:

    • Leishmania major infections are established in Phlebotomus papatasi populations in the Jordan Valley.
    • The parasite load increases within the sandfly vector over time.
    • Leishmania major infection does not appear to negatively affect the survival of Phlebotomus papatasi sandflies.