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Pertussis surveillance in one geographic area of Catalonia, 2003–2007

Abstract number: P842

Sala Farré M.R., Arias Varela C., Recasens Recasens A., Codina G.

Objectives: In Catalonia pertussis suspected cases should be reported to the Epidemiological Surveillance Unit. In 2003 a pilot surveillance program was undertaken, suspected clinical cases should be laboratory confirmed. Means to confirm cases were offered to public health services, mainly urgency wards. This report summarises the epidemiological factors associated with pertussis confirmed cases in one geographic area of Catalonia (Vallès Occidental) with 836077 inhabitants. Incidence rates and trends are described.

Methods: Clinical symptoms to suspect pertussis included cough for two weeks, and at least one of the following symptoms: dyspnea, paroxysm coughing, inspiratory whoop or post-tussive vomiting. Confirmation of cases requires PCR testing of nasopharyngeal fluid or Bordetella pertussis (BP) culture or to be epidemiologically linked to a laboratory confirmed case. Samples are analysed on a central laboratory of Hospital of Vall Hebron in Barcelona. Epidemiological data and vaccination status had been collected individually from all cases. Correct vaccination status was evaluated according to the Catalonia vaccine schedule and the age of each case.

Results: During the 2003–2007 period 127 confirmed cases were reported. Higher incidence was in 2003 and 2007 (until November) with 6.4 cases/100000 inhabitants and 5.6 cases/100000 inhabitants, respectively. Cases were more frequent on children under one year (35%) and among 10–14 years (19%) but 30–39 years old cases were 14%. Most cases have received the doses of BP vaccine recommended according the age (47%). Two cases died (1.6% lethality rate), both had one month of live. PCR were more sensitive when it was done at the first days of disease.

Conclusion: The predominance of paediatric cases can be a real incidence of cases, it may be to an increased awareness of pertussis by paediatric physicians or typical symptoms of BP infection in children; or it may be a combination of all these factors. The role of cases on vaccinated patients should be taken into account to evaluate the vaccination strategies.

Session Details

Date: 19/04/2008
Time: 00:00-00:00
Session name: 18th European Congress of Clinical Microbiology and Infectious Diseases
Subject:
Location: Barcelona, Spain
Presentation type:
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