title: [Measles epidemic in a school population. Effectiveness of the vaccine].
abstract: OBJECTIVE
  To describe the distribution of the illness according to the school students' measles vaccination status and to assess its effectiveness.
  
  
  METHODS
  Analytical study of a retrospective cohort.
  
  
  METHODS
  Two schools within the Base Health Area of San Leonardo de Yagüe, Soria.
  
  
  METHODS
  410 school students between 3 and 14. 314 were included in the study sample.
  
  
  RESULTS
  The overall vaccination rate was 81.8% and was higher among lower age groups. The overall incidence rate was 18.5%; 9.7% in those vaccinated and 57.9% in those not vaccinated. The incidence rates increased with age, 5.5% for the 3-6 and 24.5% for the 11-14 age groups. Vaccine effectiveness was measured by Relative Risk (5.9) and Attributable Fraction (83.2%), with a statistically significant association between non-vaccination and the occurrence of measles.
  
  
  CONCLUSIONS
  As measles vaccination is highly effective, it would be worthwhile to increase vaccine coverage to 93.5-96%, so that group immunity within a community can be attained and so transmission of the disease be avoided.
authors.affiliation: Centro de Salud de San Leonardo de Yagüe, Soria.
authors.forename: R
authors.initials: R
authors.lastname: Cosín Borobio
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D004196:Disease Outbreaks; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008457:Measles / Q000453:epidemiology* / Q000517:prevention & control*; D008458:Measles Vaccine; D012189:Retrospective Studies; D013030:Spain / Q000453:epidemiology
chemical_list: D008458:Measles Vaccine
vernacular_title: Epidemia de sarampión en una población escolar. Efectividad de la vacuna.