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Comprehensive Guide to Leishmania spp. Morphology and Diseases

Learn about the morphologic forms, life stages, and diseases caused by Leishmania spp., including Cutaneous, Mucocutaneous, and Visceral Leishmaniasis. Understand laboratory diagnosis methods and the distinctive features of Leishmania tropica and Leishmania donovani complexes.

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Comprehensive Guide to Leishmania spp. Morphology and Diseases

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  1. BLOOD & TISSUE FLAGELLATES/(HAEMOFLAGELLATES)Leishmania spp. Assistant lecturer Ahmed Essam

  2. Morphologic forms • There are 4 morphologic forms seen in hemoflagellates: • Amastigote • Promastigote • Epimastigote • Trypomastigote -they can exist in two or more of the 4 morphologic forms  depending on the species.

  3. Leismania sp. • Can cause: • Cutaneous leishmaniasis: a localized infection of the capillaries of the skin. • Mucocutaneousleishmaniasis: cause lesions of the skin and mucous membranes, specifically of the oral and nasal mucosa. • Visceral/ systemic leismaniasis: more generalized symptoms leading to enlargement of the internal organs, especially the liver, lymph nodes and spleen.

  4. Leishmania sp. • Divided into : • Leishmania tropica (Cutaneous Leismaniasis). 2) Leishmania donovani (Visceral leishmaniasis).

  5. Stage of life • Only have 2 stages of life: • Amastigote • Promastigote

  6. Amastigote • Shape: oval to round • Nucleus: One, eccentric. • Kinetoplast: Present, Consisting of dot-like blepharoplast, with small axoneme and prabasal body. • Flagellum: absent.

  7. Promastigote • Shape: long and slender. • Nucleus: one, central. • Kinetoplast: Anterior end of the organism, no undulating membrane. • Flagellum: Single, anterior free flagellum.

  8. Leishmania tropica complex –Cutaneous Leismaniasis • Cause a chronic disease: cutaneous leishmanisis. • Also known as Oriental sore, Delhi boil and dry or urban cutaneous leishmaniasis. • Characterized by: production of dry, raised, ulcerated lesions at bite sites. • Vectored by: tiny sandflies of the genera Phlebotomus.

  9. Leishmania tropica (promastigote)

  10. Vector: Phlebotomussandfly

  11. Sandfly vs mosquito mosquito sandfly

  12. Name of disease (Cutaneous Leismaniasis)Causes (Leishmania tropica)

  13. Life cycle( infective and diagnostic stage)

  14. Laboratory Diagnosis • Montenegro (leishmanin) skin test -delayed hypersensitivity reaction provoked by a suspension of killed leishmanial promastigotes administered intradermally. -local inflammatory reaction appears at the site of injection within 48-72 hours. • Microscopy examination. • Isoenzyme studies. • Molecular diagnostic technique- PCR • Serologic test – ex: (indirect fluorescent antibody assay).

  15. Name of parasite:Leishmania donovaniName of disease: Visceral leishmaniasis

  16. Morphology • Visceral leishmanisisalso known as Kala Azar or dum-dum fever. • The most severe of the Leishmaniasis. • Leishmania donovanicomplex –parasitize the reticuloendothelial cells, viscerotropic, infected macrophages remaining fixed or disseminate throughout the body.

  17. Phlebotomussandfly remains the vector. • In the New World (Central and South America) – Lutzomiyasandfly remains the vector.

  18. Diagnosis • Tissues Biopsy • Direct examination of stained smears. • Cultivation. • Serologic test. • Direct agglutination test (DAT). • Complement fixation test (CF). • Indirect fluorescence technique. • Molecular diagnostic technique. • Montenegro skin test (not reactive in people with active disease).

  19. Promastigotes (left) • Amastigotes (right) of Leishmania parasites. Parasites have been fixed in Giemsa stained.

  20. Name of parasite:Leishmania donovaniName of disease: Visceral leishmaniasis

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