Does the economic recession influence the incidence of pertussis in a cosmopolitan European city?

Sílvia Brugueras, Cristina Rius, Joan-Pau Millet, Martí Casals, Joan A Caylà, Barcelona Pertussis Working Group, Pere Simón, Anna de Andrés, Roser Clos, Montse Ricart, Miriam Ros, Maria José Santomà, Pilar Gorrindo, Pilar Palau, Montse Cunillé, Eva Masdeu, Ingrid Avellanés, Jose Ángel Rodrigo, Gema Codina, Maria Teresa Martin, Juan José González, Sònia Brió, Jessica Del Carpio, Andrea Otero, Álvaro Díaz, Núria López, Montse Vaqué, Pere Sala, Marta Calsina, Yolanda Meije, Eulàlia Guasch, Maria Rosa Pascual, Carme Palasi, Anna Luz Moro, Manel Enrubia, Gemma Monsó, Joan Martí Solé, Paloma Rodríguez, Helena Pallarès, Antoni Salvà, Ángeles Ferrández, Ana María Hostalot, María Carmen Muñoz, Anna de Andrés, Sílvia Brugueras, Cristina Rius, Joan-Pau Millet, Martí Casals, Joan A Caylà, Barcelona Pertussis Working Group, Pere Simón, Anna de Andrés, Roser Clos, Montse Ricart, Miriam Ros, Maria José Santomà, Pilar Gorrindo, Pilar Palau, Montse Cunillé, Eva Masdeu, Ingrid Avellanés, Jose Ángel Rodrigo, Gema Codina, Maria Teresa Martin, Juan José González, Sònia Brió, Jessica Del Carpio, Andrea Otero, Álvaro Díaz, Núria López, Montse Vaqué, Pere Sala, Marta Calsina, Yolanda Meije, Eulàlia Guasch, Maria Rosa Pascual, Carme Palasi, Anna Luz Moro, Manel Enrubia, Gemma Monsó, Joan Martí Solé, Paloma Rodríguez, Helena Pallarès, Antoni Salvà, Ángeles Ferrández, Ana María Hostalot, María Carmen Muñoz, Anna de Andrés

Abstract

Background: In the last few years, pertussis has re-emerged worldwide. The aim of this article is to study how the incidence of the disease has evolved in Barcelona city over a 16-year period, and determine which factors are associated with the evolution of the disease. We discuss the causes of the observed changes considering different possibilities such as vaccination coverage, vaccine effectiveness, increased surveillance or the effect of the current economic recession.

Methods: We performed a cross-sectional, observational, population-based descriptive study using data for the 2000-2015 period from the notifiable diseases register maintained by Barcelona Public Health Agency. We used Poisson regression to compute adjusted odds ratios (aOR) and their corresponding 95% confidence intervals (CI).

Results: A total of 1791 cases were registered. The incidence of the disease increased throughout the city from 2011 onwards. While children under 1 year of age had the highest-incidence and were the most at risk (aOR = 27.18, CI:23.51-31.44), we found that the age of affected children was higher in the last years. Incidence proportion (PRR) was lower among foreign-born children than native children (PRR = 0.43 CI:0.32-0.58). In the whole-cell vaccine period (2000-2004), the percentage of cases under 1 year of age who received the vaccine was lower than in 2005-2015 when the acellular vaccine was used (p = 0.01), suggesting a lower efficacy of the acellular vaccine. However, vaccination coverage in children under 6 years remained high (~ 90%), and there were no significant year-to-year variations (p = 0.757). Moreover, there did not appear to be any significant restrictions in medical care. According to the index of disposable household income (DHI), pertussis incidence increased from 2011 onwards in all neighbourhoods and remained higher in those with lower DHI.

Conclusions: The noteworthy increase in pertussis incidence does not seem to be due to the economic recession, but to other factors here described.

Keywords: Bordetella pertussis; Cities; Economic recession; Epidemiology; Pertussis vaccine; Whooping cough.

Conflict of interest statement

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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Figures

Fig. 1
Fig. 1
Incidence of pertussis in Barcelona, 2000–2015. a Incidence of pertussis in Barcelona according to sex, 2000–2015. b Incidence of pertussis in Barcelona according to age group, 2000–2015. c Incidence of pertussis in Barcelona according to index of Disposable Household Income, 2000–2015. d Incidence of pertussis among under 15-year-olds according to country of origin, Barcelona 2011–2015

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