MICHAEL ABBEY / SCIENCE PHOTO LIBRARY MICHAEL ABBEY / SCIENCE PHOTO LIBRARY
Leishmania donovani. Light micrograph of the parasitic protozoa Leishmania donovani. They have whip-like flagella for locomotion. Leishmania sp. cause leishmaniasis, a tropical disease transmitted by bites from infected sand-flies. These are the promastigote form of the parasite. There are two forms of leishmaniasis. The first, cutaneous leishmaniasis, affects the skin giving rise to an ulcer at the site of the bite. This mainly heals naturally, although scarring may occur. The more serious, visceral leishmaniasis (kala-azar), causes fever and liver damage, and can be fatal. Phase contrast. Magnification: x250 at 35mm size.
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