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BMC Pulmonary Medicine

, 17:106

Epidemiology and public health


BackgroundThe role of air pollution in increasing susceptibility to respiratory tract infections in the cystic fibrosis CF population has not been well described. We recently demonstrated that chronic PM2.5 exposure is associated with an increased risk of initial Pseudomonas aeruginosa acquisition in young children with CF. The purpose of this study was to determine whether PM2.5 exposure is a risk factor for acquisition of other respiratory pathogens in young children with CF.

MethodsWe conducted a retrospective study of initial acquisition of methicillin susceptible and methicillin resistant Staphylococcus aureus MSSA and MRSA, Stenotrophomonas maltophilia and Achromobacter xylosoxidans in U.S. children <6 years of age with CF using the CF Foundation Patient Registry, 2003–2009. Multivariable Weibull regression with interval-censored outcomes was used to evaluate the association of PM2.5 concentration in the year prior to birth and risk of acquisition of each organism.

ResultsDuring follow-up 63%, 17%, 24%, and 5% of children acquired MSSA, MRSA, S. maltophilia, and A. xylosoxidans, respectively. A 10 μg-m increase in PM2.5 exposure was associated with a 68% increased risk of MRSA acquisition Hazard Ratio: 1.68; 95% Confidence Interval: 1.24, 2.27. PM2.5 was not associated with acquisition of other respiratory pathogens.

ConclusionsFine particulate matter is an independent risk factor for initial MRSA acquisition in young children with CF. These results support the increasing evidence that air pollution contributes to pulmonary morbidities in the CF community.

KeywordsCystic fibrosis Staphylococcus aureus MRSA Stenotrophomonas maltophilia Achromobacter xylosoxidans Fine particulate matter Air pollution AbbreviationsA. xylosoxidansAchromobacter xylosoxidans

CFcystic fibrosis

CFTRcystic fibrosis transmembrane conductance regulator

CIconfidence interval

FEV1forced expiratory volume in one second

HRhazard ratio

IDWinverse distance weighted

MRSAmethicillin-resistant Staphylococcus aureus

MSSAmethicillin-susceptible Staphylococcus aureus

NO2nitrogen dioxide

ORodds ratio

P. aeruginosaPseudomonas aeruginosa

PM10particulate matter ≤10 μm in aerodynamic diameter

PM2.5particulate matter ≤2.5 μm in aerodynamic diameter

S. maltophiliaStenotrophomonas maltophilia

SDstandard deviation

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Autor: Kevin J. Psoter - Anneclaire J. De Roos - Jon Wakefield - Jonathan D. Mayer - Margaret Rosenfeld


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