Haemophilus influenzae type b (Hib) is a major cause of meningitis and pneumonia with high morbidity and mortality rates in young children. The introduction of effective and well-tolerated conjugate Hib vaccines, has nearly eradicated this disease in many countries. We investigated the safety of the Hib PRP-CRM197 vaccine in a multi-center post-marketing surveillance (PMS) study. Korean children (N = 764) aged 1-33 months were enrolled when receiving a routine primary immunization or a booster vaccine with Hib PRP-CRM197 and solicited and unsolicited adverse events (AEs) were recorded using a diary card for 7 and 28 days after each vaccination, respectively. In this study, AEs were reported by 66% of subjects but were generally mild, with 42% of subjects reporting solicited AEs and 46% reporting unsolicited AEs. Among the unsolicited AEs, 98% were determined to be unrelated to the study vaccine. The studied Hib PRP-CRM197 vaccine was well tolerated by the study group and found to have a similar safety profile to that reported in other clinical studies. This vaccine is suitable for routine immunization against Hib disease among Korean children. AEs due to this vaccine will continue to be monitored.

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