“…However, families not related living closely have different incidence of disease and infection (Thakur 1984, Evans et al 1985, Costa et al 1986, Badaró et al 1986b, Dhiman & Sen 1991 and evidence of a genetic predisposition for development of the human disease is lacking. In this study 8 of the 12 cases of VL that were diagnosed in a period of 12 months occurred in three families, indicating that genetic studies need to be performed.…”