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Rotavirus in India: Forty Years of Research. Rotavirus was first identified as a human pathogen just over 40 years ago, and work on this pathogen in India started shortly thereafter. Subsequent studies have confirmed its pre-eminent role in gastroenteritis in children in India. Standardized surveillance has enabled the documentation of the high burden of disease, and has demonstrated that there is considerable geographic and temporal variation in strain circulation. Internationally licensed vaccines, vaccine candidates based on indigenous strains and out-licensed strains have been tested for safety, immunogenicity and efficacy; three vaccines are now licensed in India and are used in the private sector. Public sector vaccination has begun, and it will be path-breaking for Indian vaccinologists to measure impact of vaccine introduction in terms of safety and effectiveness. So far, India has kept pace with international epidemiologic and vaccine research on rotavirus, and these efforts should continue.