The minister has named Ranjit Roy Chaudhury, a leading clinical pharmacologist who headed the World Health Organisation's rational use of drugs in India programme, to coordinate the core group.Kala azar, globally known as visceral leishmaniasis, usually strikes during the monsoon months. It is the second deadliest vector-borne disease after malaria.At present, its incidence is concentrated in 54 districts of India with Bihar the most affected.