Effectiveness of Varicella Vaccination Program in Preventing Laboratory-Confirmed Cases in Children in Seoul, Korea
Journal of Korean Medical Science
;
: 1897-1901, 2016.
Article
in English
| WPRIM
| ID: wpr-173624
ABSTRACT
A universal one-dose varicella vaccination program was introduced in 2005 in Republic of Korea. However, the incidence of varicella in Korea has tripled over the last decade. We conducted a community based 11 matched case-control study to assess the effectiveness of one MAV strain-based vaccine and three Oka strain-based vaccines licensed for use in Korea. All cases were children in Seoul, Korea with varicella who were reported to the National Notifiable Disease Surveillance System in Seoul during 2013. The controls were age-matched children with mumps or scarlet fever but no history of varicella. We included 537 cases and 537 controls. The overall effectiveness of one dose of varicella vaccination was 13% (95% confidence interval [CI], −17.3–35.6). Of the four licensed varicella vaccines, only one was highly effective (88.9%; 95% CI, 52.1–97.4). The vaccine effectiveness for the other vaccines were 71.4% (95% CI, −37.5–94.1), −5% (95% CI, −61.9–31.9), and −100% (95% CI, −700–50.0). The overall effectiveness of vaccination was 75.8% (95% CI, 22.8–92.4) in the first year after vaccination and decreased thereafter; the effectiveness became −7.2% (95% CI, −130.9–59.2) in the fourth year after vaccination. Further studies are warranted to investigate reduced effectiveness of varicella vaccines in Korea.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Scarlet Fever
/
Vaccines
/
Case-Control Studies
/
Chickenpox
/
Incidence
/
Vaccination
/
Republic of Korea
/
Seoul
/
Korea
/
Mumps
Type of study:
Evaluation studies
/
Incidence study
/
Observational study
/
Prognostic study
/
Risk factors
Limits:
Child
/
Humans
Country/Region as subject:
Asia
Language:
English
Journal:
Journal of Korean Medical Science
Year:
2016
Type:
Article
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