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Etiological agent of the visceral leishmaniasis

What is etiological agent of the visceral leishmaniasis? How disease transmitted and what are its typical manifestations?

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Visceral leishmaniasis is caused by protozoan Leishmania donovani.

The transmission is alike to the cutaneous leishmaniasis, by bite of sand flies. The influenced organs generally are the liver, spleen and bone marrow. The patient frequently has fever, weight loss, splenomegaly (hypertrophy of the spleen), and anemia and reduced counts of platelets and leukocytes. The disease might cause death.

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