Lesson learned from investigating cluster adverse event following immunization in mass campaign of Japanese Encephalitis vaccine in India

摘要

Background: Vaccine safety is one of the critical parameters for quality assurance in immunization program in all countries including developing country like India as it adds new vaccines to its existing immunization program. Occurrence of adverse events following immunization (AEFI) and spread of unchecked rumors can hamper community confidence in vaccines adversely affecting coverage. Cluster AEFI (2 or more reports occurring together) get heightened attention from media, government and community and can affect performance of immunization program.