Few days - 8 months. Kala azar (leishmania) is caused a parasite which is spread by the bite of an infected sandfly. There are several forms of leishmania from different parts of the globe; each has it's own set of symptoms. Travelers are most likely to encounter a chronic, non-healing skin sore. Treatment usually requires the help of an infectious disease specialist. Www. Ncbi. Nlm. Nih. Gov/pubmedhealth/pmh0002362/.