Visceral Leishmaniasis (VL) is a major health problem in Bihar, India. The disease is caused by a protozoan parasite Leishmania donovani and transmitted by the established vector Phlebotomus argentipes (Diptera: Psychodidae) in India. P. argentipes transmits viral and bacterial pathogens. Nematodes were isolated from the body of P. argentpes for the first time in India. Its role as pathogen is yet to be established.