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Influence of chronic illnesses and underlying risk conditions on the incidence of pneumococcal pneumonia in older adults

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Abstract

Objective

To investigate hospitalizations from pneumococcal pneumonia in older adults with specific underlying chronic conditions, evaluating the influence of these conditions in developing pneumonia.

Methods

Population-based cohort study involving 27,204 individuals ≥60 years old in Southern Catalonia, Spain. All cases of hospitalization from pneumococcal pneumonia (bacteremic and nonbacteremic) were collected since 01/12/2008 until 30/11/2011. Cox regression was used to calculate hazards ratio (HR) and estimate the association between baseline conditions and the risk of developing pneumococcal pneumonia.

Results

Maximum incidences (per 1000 person-years) appeared among patients with history of prior pneumonia (14.6), nursing home residents (12.8), persons with immunodeficiency/asplenia (7.7) and patients with chronic pulmonary disease (7.6). In multivariable analysis, age (HR: 1.05), nursing home residence (HR: 4.59), history of prior pneumonia (HR: 3.58), stroke (HR: 2.50), chronic heart disease (HR: 1.53), chronic pulmonary disease (HR: 4.09), diabetes mellitus (HR: 1.66), smoking (HR: 1.69) and immunosuppressive medication (HR: 1.87) appeared significantly associated with an increased risk of pneumococcal pneumonia.

Conclusion

Our data support that nursing home residence, chronic pulmonary disease and immunocompromising conditions are the underlying conditions most strongly associated with an increasing risk of pneumococcal pneumonia in older adults. This data underline the need for better prevention strategies among these persons.

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Acknowledgments

We thank the following persons for their contributions to data collection, analysis, laboratory work or manuscript preparation: Angels Vilanova and Josepa Tapiol (Hospital Joan XXIII), Xavier Cliville (Hospital Santa Tecla), Angel Vila-Rovira (Research Assistance on mortality data) and Timothy Bowring (assistance in the preparation of the manuscript). Funding for the study was provided, in part, by a grant from the “Fondo de Investigación Sanitaria” of the Instituto de Salud Carlos III, (09/00043). This study sponsor had no role in the design or implementation of the study, analysis of data, or reporting of the results.

Conflict of interest

The corresponding author had full access to all the data in the study and had final responsibility for the decision to submit for publication. All the authors declare that they have not conflict of interest.

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Correspondence to Olga Ochoa-Gondar.

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On behalf of EPIVAC Research Group.

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Vila-Corcoles, A., Aguirre-Chavarria, C., Ochoa-Gondar, O. et al. Influence of chronic illnesses and underlying risk conditions on the incidence of pneumococcal pneumonia in older adults. Infection 43, 699–706 (2015). https://doi.org/10.1007/s15010-015-0801-y

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  • DOI: https://doi.org/10.1007/s15010-015-0801-y

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