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Factors influencing the spread of pertussis in households: a prospective study, Catalonia and Navarre, Spain, 2012 to 2013
- Pere Godoy1,2,3 , Manuel García-Cenoz2,4,5 , Diana Toledo2,6 , Glòria Carmona1 , Joan A Caylà2,7 , Miquel Alsedà1,3 , Josep Àlvarez1 , Irene Barrabeig1 , Neus Camps1 , Pere Plans1,2 , María Company1 , Jesús Castilla2,4 , Maria-Rosa Sala-Farré1 , Carmen Muñoz-Almagro2,8,9 , Cristina Rius2,7 , Àngela Domínguez2,6 , for the Transmission of Pertussis in Households Working Group10
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View Affiliations Hide AffiliationsAffiliations: 1 Agència de Salut Pública de Catalunya, Barcelona, Spain 2 Ciber de Epidemiología y Salud Pública, CIBERESP, Madrid, Spain 3 Institut de Recerca Biomèdica de Lleida, IRBLleida, Lleida, Spain 4 Instituto de Salud Pública de Navarra, IdiSNA, Pamplona, Spain 5 Universidad Pública de Navarra (UPNA), Navarre, Spain 6 Universitat de Barcelona, Barcelona, Spain 7 Agència de Salut Pública de Barcelona, Barcelona, Spain 8 Hospital de Sant Joan de Dèu, Barcelona, Spain 9 Universitat Internacional de Catalunya, Barcelona, Spain 10 Members of the group are listed at the end of the articlePere Godoypere.godoy gencat.cat
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Citation style for this article: Godoy Pere, García-Cenoz Manuel, Toledo Diana, Carmona Glòria, Caylà Joan A, Alsedà Miquel, Àlvarez Josep, Barrabeig Irene, Camps Neus, Plans Pere, Company María, Castilla Jesús, Sala-Farré Maria-Rosa, Muñoz-Almagro Carmen, Rius Cristina, Domínguez Àngela, for the Transmission of Pertussis in Households Working Group. Factors influencing the spread of pertussis in households: a prospective study, Catalonia and Navarre, Spain, 2012 to 2013 . Euro Surveill. 2016;21(45):pii=30393. https://doi.org/10.2807/1560-7917.ES.2016.21.45.30393 Received: 25 Apr 2015; Accepted: 28 Feb 2016
Abstract
We aimed to investigate transmission rates of pertussis in household contacts of cases and factors associated with transmission. A prospective epidemiological study was conducted in 2012 and 2013 to determine the incidence of pertussis among household contacts of reported cases in Catalonia and Navarre, Spain. An epidemiological survey was completed for each case and contact, who were followed for 28 days to determine the source of infection (primary case) and detect the occurrence of secondary cases. Odds ratios (ORs) were used to estimate the effectiveness of vaccination and chemoprophylaxis in preventing new cases, using the formula (1 − OR) × 100. For the 688 primary cases, a total of 2,852 contacts were recorded. The household transmission rate was 16.1% (459/2,852) and rose according to the age (> 18 years) and lack of immunisation of the primary cases, and also the age (0–18 years), family relationship (siblings and children), lack of vaccination and chemoprophylaxis of contacts. Pertussis vaccine effectiveness in preventing new cases was 65.0% (95% confidence interval (CI): 11.6 to 86.2) for full vaccination (≥ 4 doses) and 59.7% (95% CI: −6.8 to 84.8) for incomplete vaccination (< 4 doses). The effectiveness of chemoprophylaxis was 62.1% (95% CI: 40.3 to 75.9). To reduce household transmission, contacts should be investigated to detect further cases and to administer chemoprophylaxis. The current vaccination status of cases and contacts can reduce household transmission.
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