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Published on: February 22, 2019
Matched case-control study of effectiveness of live, attenuated S79 mumps virus vaccine against clinical mumps
Chuanxi Fu1, Jianhua Liang, Ming Wang
1Department of Expanded Programmed Immunization, Guangzhou Center for Disease Control and Prevention, Guangzhou, China. fuchuanxi@gmail.com
Insights
The S(79) mumps vaccine effectively prevents clinical mumps in children. A second dose is recommended for sustained protection, especially in the long term.
Area of Science:
- Virology
- Immunology
- Pediatrics
Background:
- Mumps virus infection poses risks to children and young adults.
- The S(79) live, attenuated mumps virus vaccine has been available in China since 1990 without prior efficacy assessment.
- Clinical mumps remains a concern in pediatric populations.
Purpose of the Study:
- To evaluate the effectiveness of the S(79) mumps virus vaccine against clinical mumps.
- To determine the impact of one versus two doses on vaccine effectiveness.
- To assess vaccine effectiveness over time post-vaccination.
Main Methods:
- A case-control study design was employed.
- Cases and controls (n=469 each) were matched by gender, age, and residency.
- Vaccination data were retrieved from the Children's Expanded Program on Immunization Administrative Computerized System.
Main Results:
- One dose of the S(79) vaccine demonstrated 86.0% effectiveness (95% CI, 77.2% to 91.5%) against clinical mumps.
- Vaccine effectiveness waned significantly between 5 to 12 years post-vaccination compared to the first 4 years.
- A higher effectiveness was observed with two doses, indicating the need for a booster.
Conclusions:
- The S(79) mumps virus vaccine is effective in preventing clinical mumps.
- A second dose of the mumps vaccine is crucial for ensuring long-term protection in children in China.
- Public health strategies should consider a two-dose schedule for optimal mumps prevention.
Abstract:
Mumps virus infection is a potentially serious viral infection of childhood and early adulthood. In China, live, attenuated S(79) mumps virus vaccine has been licensed for pediatric use since 1990. There has been no assessment of its efficacy. Thus, the objective of this study was to determine the effectiveness of live, attenuated S(79) mumps virus vaccine against clinical mumps. Cases were selected from the China Information System for Disease Control and Prevention during September 2004 to March 2005. Each case was matched to a control by gender, age, and area of residency. In all, 469 cases and 469 controls were enrolled in the study. Vaccination information was obtained from the Children's EPI Administrative Computerized System. Vaccine effectiveness (VE) was calculated for one or two doses of S(79) vaccine, with 95% confidence intervals (CI). VE of mumps virus vaccine for one dose versus none was protection of 86.0% (95% CI, 77.2% to 91.5%) of recipients, and VE was much higher in the first 4 years than in the 5 to 12 years after vaccination. The S(79) vaccine can effectively prevent clinical mumps, and a second dose of mumps virus vaccine is necessary for the protection of children in China.
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