MICHAEL ABBEY / SCIENCE PHOTO LIBRARY MICHAEL ABBEY / SCIENCE PHOTO LIBRARY
Leishmaniasis. Light micrograph of a section through a human liver, showing a white blood cell (centre) infected by Leishmania donovani, the par- asitic protozoan causing visceral leishmaniasis. The protozoa are the pale dots in the cell's cytoplasm (purple). L. donovani switches between two main forms during its life-cycle, one living in each of its hosts: humans and sandflies. These amastigotes (Leishman-Donovan bodies) occur in humans. The parasite passes between the hosts when sandflies feed on human blood. Without drug treatment, visceral leishmaniasis (kala-azar) can be fatal. Brightfield illumination. Magnification: x400 at 35mm size.
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