Investigation on a pertussis outbreak in a military school: Risk factors and approach to vaccine efficacy

爆发 医学 百日咳 病毒学 接种疫苗
作者
Franck Berger,Elisabeth Njamkepo,S. Minaberry,Aurélie Mayet,R. Haus-Cheymol,C. Verret,Bruno Massit,Nicole Guiso,A Spiegel
出处
期刊:Vaccine [Elsevier BV]
卷期号:28 (32): 5147-5152 被引量:31
标识
DOI:10.1016/j.vaccine.2010.05.070
摘要

Pertussis (whooping cough) is a toxic bacterial infection caused mainly by Bordetella pertussis. In mid-January 2006, several cases of pertussis were diagnosed in a military boarding-school. An investigation was carried out at the end of January to identify the risk factors for infection and to evaluate the efficacy of vaccination. Three definitions were used to distinguish the cases; confirmed biologically, confirmed epidemiologically and suspected cases. The risk factor study was carried out after the exclusion of suspect cases. Vaccine efficacy (VE) was evaluated from a case–control study where only biologically confirmed cases were included. For each case, five controls were matched according to age, sex and class. A logistic regression and a conditional logistic regression were performed for the risk factor study and vaccine efficacy, respectively. Statistical analysis was carried out using Stata 9.2™ software. A total of 206 cases were included, 17 of them biologically confirmed, 66 epidemiologically and 123 suspected cases. The attack rate was 17.8 per 100. Girls were 1.8 times more likely to catch pertussis (p = 0.04), pupils in the first year of college, as well as those in high school were at 5 times greater risk of catching pertussis (p = 0.008) than those in the second year of college. For pupils who benefited from at least 5 doses, the VE was at 80% when the last dose dated from less than 6 years earlier. The attack rate observed in our study was similar to those normally seen during epidemics occurring within a community. Vaccine efficacy declined depending on the time lapse since the last vaccination. Since April 2008, the Public Health Authorities have planned to provide pertussis booster vaccinations for children aged 16–18 who missed those for 11–13-year-old, and for adults aged 26–27 and those who have not been vaccinated for more than 10 years.
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