Life cycle of the Leishmaniasis parasite. Source: CDC
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Leishmaniasis

Leishmaniasis is a disease caused by parasites that belong to the genus Leishmania and is transmitted by the bite of certain species of sandfly, including flies in the genus Lutzomyia in the new world and Phlebotomus in the old world. Synonyms for leishmaniasis include kala azar, black fever, sandfly disease, Dum-Dum fever and espundia. The disease is named for the Scottish pathologist William Boog Leishman. more...

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Most forms of the disease are transmittable only from animals (zoonosis), but some can be spread between humans. Human infection is caused by about 21 of 30 species that infect mammals. These include the L. donovani complex with 3 species (L. donovani, L. infantum, and L. chagasi); the L. mexicana complex with 3 main species (L. mexicana, L. amazonensis, and L. venezuelensis); L. tropica; L. major; L. aethiopica; and the subgenus Viannia with 4 main species (L. (V.) braziliensis, L. (V.) guyanensis, L. (V.) panamensis, and L. (V.) peruviana). The different species are morphologically indistinguishable, but they can be differentiated by isoenzyme analysis, molecular methods, or monoclonal antibodies.

Geography and epidemiology

Leishmaniasis can be transmitted in many tropical and sub-tropical countries, and is found in parts of about 88 countries. Approximately 350 million people live in these areas. The settings in which leishmaniasis is found range from rain forests in Central and South America to deserts in West Asia. More than 90 percent of the world's cases of visceral leishmaniasis are in India, Bangladesh, Nepal, Sudan, and Brazil.

Leishmaniasis is found in Mexico, Central America, and South America—from northern Argentina to southern Texas (not in Uruguay, Chile, or Canada), southern Europe (leishmaniasis is not common in travelers to southern Europe), Asia (not Southeast Asia), the Middle East, and Africa (particularly East and North Africa, with some cases elsewhere).

Leishmaniasis is present in Iraq and was contracted by a number of the troops involved in the 2003 invasion of that country and the subsequent occupation. The soldiers nicknamed the disease the Baghdad boil. It has been reported by the Agence France-Presse that more than 650 U.S. soldiers may have experienced the disease between the start of the invasion in March 2003 and late 2004.

During 2004, it is calculated that some 3,400 troops from the Colombian army, operating in the jungles near the south of the country (in particular around the Meta and Guaviare departments), were infected with Leishmaniasis. Apparently, a contributing factor was that many of the affected soldiers did not use the officially provided insect repellent, because of its allegedly disturbing odor. It is estimated that nearly 13,000 cases of the disease were recorded in all of Colombia throughout 2004, and about 360 new instances of the disease among soldiers had been reported in February 2005.

In September 2005 the disease was contracted by at least four Dutch marines who were stationed in Mazar-e-Sharif, Afghanistan and subsequently repatriated for treatment.

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