Indian kala-azar caused by Leishmania tropica

Kala-azar, or visceral leishmaniasis, in India is generally assumed to be a result of infection with Leishmania donovani. 15 parasite isolates collected over the past 10 years from patients with classical disease were typed by monoclonal antibodies, isoenzymes, and kDNA analysis. 4 were shown to be L tropica, a species historically associated with cutaneous disease and more recently a mild "visceralising" disease from the Desert Storm experience. The results confirm that L tropica is a coendemic agent of visceral leishmaniasis in India, and may shed light on the rising frequency of therapeutic unresponsiveness to sodium antimony gluconate, which complicates treatment of this lethal disease.