Visceral leishmaniasis natural history, complications and prognosis: Difference between revisions
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Visceral leishmaniasis Microchapters |
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Natural History, Complications and Prognosis
Mis-diagnosis is dangerous, as without proper treatment the mortality rate for kala-azar is close to 100%. L. donovani itself is not usually the direct cause of death in kala-azar sufferers, however. Pneumonia, tuberculosis and dysentery are omnipresent in the depressed regions where leishmaniasis thrives, and, as with AIDS, it is these opportunistic infections that are more likely to kill, flaring up in a host whose immune system has been weakened by the L. donovani infection. Progress of the disease is extremely variable, taking anywhere from one to twenty weeks, but a typical duration for the Sudanese strain of the disease is narrower, between twelve and sixteen weeks.
Even with recovery, kala-azar does not always leave its hosts unmarked. Some time after successful treatment—generally a few months with African kala-azar, or as much as several years with the Indian strain—a secondary form of the disease may set in, called post kala-azar dermal leishmaniasis, or PKDL. This condition manifests first as small, measle-like skin lesions on the face, which gradually increase in size and spread over the body. Eventually the lesions may coalesce to form disfiguring, swollen structures resembling leprosy, and occasionally causing blindness if they spread to the eyes. (This disease is not the same as cutaneous leishmaniasis, a milder disease caused by another protozoan of the Leishmania genus which also causes skin lesions).