<prompt> Lepra bacilli are mainly transmitted bySkin contactDropletsStoolUrine  <response>: Ans. b Droplets. Ref. Ananthanarayan, Microbiology, 6thpg.361LEPRA BACILLI Acid-fast bacilli, but less acid fast than TB bacilli. H2SO4 used for decolorization of lepra bacilli 5 is of less concentration than that for TB bacilli 25. Virchow lepra or foam cells in which globi of bacilli occur are large undifferentiated histiocytes. Leprosy is exclusive human disease and patients are the only source of infection. Very large numbers of bacilli are shed in nasal secretions 107day, hence droplet is important mode of spread. Mode of entry: Respiratory tract or through skin. IP: 2-5years few years to 30 days Not a highly communicable disease. Prevalance in MH 1971 census 5-8 cases per 1000 population. Total no.of patients in India--4 million. 