Background: In India, rickettsial infections were first reported from Assam and West Bengal lay back during 1947. Since then, sporadic cases have been reported from different parts of the country except in the north eastern (NE) states. However, after a gap of 68 years, scrub typhus was reported to resurge in three states of NE region in 2012. This long serenity may be due to lack of surveillance and low index of suspicion for scrub typhus and other rickettsial infections. Therefore, a two year study was undertaken to study the sero-epidemiology of rickettsial infections viz., Scrub typhus (ST), Spotted fever group rickettsia (SFGR) and typhus group rickettsia (TGR) in Northeast India.
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