Concurrent infection with two agents can result in an illness having overlapping symptoms creating a diagnostic dilemma for the treating physician. The symptoms of dengue may mimic other diseases such as leptospirosis, influenza A, Salmonella Typhi, Japanese encephalitis, chikungunya and malaria. There is paucity of data regarding dengue and typhoid co- infection both in the developed and developing countries. This study attempts to find the current co- infection rates in North Delhi.