![]() ![]() Confounding effects of other risk variables were not observed. The effectiveness of the JE vaccine was 92.9%. Thirty cases and 120 controls were enrolled. The vaccination history was ascertained through JE immunization logbooks maintained at local health centers. Each case was matched to four healthy controls for age, gender, and neighborhood. Cases were identified through an ongoing hospital-based surveillance. This study aims at evaluating the effectiveness of Viet Nam's MBV.Ī matched case-control study was conducted in Northern Viet Nam. locally-produced, mouse brain-derived, inactivated JE vaccine (MBV) were given. ![]() In 1997, the Vietnamese government initiated immunization campaigns targeting all children aged 1-5 years. JE often occurs in large epidemics, has a high case-fatality ratio and, among survivors, frequently causes persistent neurological sequelae and mental disabilities. Japanese encephalitis (JE) is a flaviviral disease of public health concern in many parts of Asia.
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