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[An epidemic outbreak of measles in a rural area]
M L de la Puente1, R Corio, J Alvarez
1Departament de Sanitat i Seguretat Social, Generalitat de Catalunya.
Objective:
Analysis of an outbreak of measles among a partially vaccinated school population: the epidemiology, the effectiveness of the control measures and the efficacy of the vaccine (EV).
Design:
A descriptive study and cohorts study.
Setting:
Primary Care in the borough of Sant Andreu de la Barca.
Patients And Others Participants:
The school population of Sant Andreu de la Barca.
Measurements And Main Results:
The outbreak lasted three months and twenty days, with 95 cases overall. The most affected age group was form 4 to 10. 8.4% presented complications. Children were infected at school in 87% of the cases. The overall infection rate of the population between 0 and 15 was 2.4%. 36% of the cases had been correctly immunized and 43% were preventable cases. Vaccine coverage contacts was 67%. 84% of the susceptible contacts were vaccinated. Immunization status and immunization age of 323 out of 500 pupils was studied for the EX analysis. Global EV was 66% (42-80), 58% (13-80) for those immunized, between 12-14 month of age and 71% (43-85) for those immunized after the 15 month of age.
Conclusions:
In order to eradicate the autoctonous measles an increase in immunization coverage, an improvement in the epidemiologic surveillance, and in the outbreak control measures are needed.