title: Short-term safety of live attenuated Japanese encephalitis vaccine (SA14-14-2): results of a randomized trial with 26,239 subjects.
abstract: The short-term safety of an effective and inexpensive new live attenuated Japanese encephalitis vaccine (SA14-14-2) was studied in a randomized trial, using block randomization. Of 26,239 children who were enrolled, half received the vaccine and half served as controls. Subjects were prospectively followed for 30 days for severe adverse events, such as encephalitis, meningitis, and "all-cause" hospitalization. No cases of encephalitis or meningitis occurred in either group. The upper 95% confidence limit for adverse events not occurring among subjects receiving their first dose was 4.1/10,000. Risk ratios and 95% confidence intervals for other adverse events were 0.70 (0.43-1.15) for all-cause hospitalization, 0.91 (0.37-2.22) for seizure, and 0.79 (0.56-1.11) for fever lasting > or = 3 days. These data attest to the short-term safety of the SA14-14-2 virus strain and the hamster kidney cell substrate.
authors.affiliation: Department of Pediatrics, West China University of Medical Sciences, and Chengdu Anti-epidemic Station, Sichuan.
authors.forename: Z L
authors.initials: ZL
authors.lastname: Liu
authors.forename: S
authors.initials: S
authors.lastname: Hennessy
authors.forename: B L
authors.initials: BL
authors.lastname: Strom
authors.forename: T F
authors.initials: TF
authors.lastname: Tsai
authors.forename: C M
authors.initials: CM
authors.lastname: Wan
authors.forename: S C
authors.initials: SC
authors.lastname: Tang
authors.forename: C F
authors.initials: CF
authors.lastname: Xiang
authors.forename: W B
authors.initials: WB
authors.lastname: Bilker
authors.forename: X P
authors.initials: XP
authors.lastname: Pan
authors.forename: Y J
authors.initials: YJ
authors.lastname: Yao
authors.forename: Z W
authors.initials: ZW
authors.lastname: Xu
authors.forename: S B
authors.initials: SB
authors.lastname: Halstead
mesh_terms: D000818:Animals; D002648:Child; D002675:Child, Preschool; D006224:Cricetinae; D004664:Encephalitis Virus, Japanese / Q000276:immunology*; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D014611:Vaccination; D014765:Viral Vaccines / Q000009:adverse effects*
chemical_list: D014765:Viral Vaccines