DDWCK Dissanayake, SM Handunnetti, N Fernando, D Gangani, RD Silva, S Premawansa. Changes in peritoneal lymphocyte subpopulations and antibody response in rats immunized with purified LPS of pathogenic and non-pathogenic Leptospira spp. (PP04). Proceedings of the 9^th Biennial Scientific Sessions, Allergy and Immunology Society of Sri Lanka, pp 30