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Dr Kaul's research interests focus on: (1) the genital immune correlates of HIV transmission and susceptibility in the male and female genital tract; (2) the role of the gut mucosa in HIV pathogenesis and disease; and (3) the epidemiology of HIV and coinfections in HIV-affected Toronto communities. This research is based in clinical cohorts from Canada, Kenya and Uganda. His work is supported by a Memorandum of Understanding with the University of Nairobi, and by research funding from the OHTN, CIHR, NIH and Gates Foundation.