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The impact of ambient fine particles on influenza transmission and the modification effects of temperature in China: A multi-city study

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posted on 01.01.2017, 00:00 authored by G Chen, W Zhang, S Li, Y Zhang, G Williams, Rachel HuxleyRachel Huxley, H Ren, W Cao, Y Guo
© 2016 Elsevier Ltd Background There is good evidence that air pollution is a risk factor for adverse respiratory and vascular health outcomes. However, data are limited as to whether ambient fine particles contribute to the transmission of influenza and if so, how the association is modified by weather conditions. Objectives We examined the relationship between ambient PM2.5 and influenza incidence at the national level in China and explored the associations at different temperatures. Methods Daily data on concentrations of particulate matter with aerodynamic diameter < 2.5 μm (PM2.5) and influenza incidence counts were collected in 47 Chinese cities. A Poisson regression model was used to estimate the city-specific PM2.5-influenza association, after controlling for potential confounders. Then, a random-effect meta-analysis was used to pool the effects at national level. In addition, stratified analyses were performed to examine modification effects of ambient temperature. Results For single lag models, the highest effect of ambient PM2.5 on influenza incidence appeared at lag day 2, with relative risk (RR) of 1.015 (95% confidence interval (CI): 1.004, 1.025) associated with a 10 μg/m3 increase in PM2.5. For moving average lag models, the significant association was found at lag 2–3 days, with RR of 1.020 (95% CI: 1.006, 1.034). The RR of influenza transmission associated with PM2.5 was higher for cold compared with hot days. Overall, 10.7% of incident influenza cases may result from exposure to ambient PM2.5. Conclusions Ambient PM2.5 may increase the risk of exposure to influenza in China especially on cooler days. Control measures to reduce PM2.5 concentrations could potentially also be of benefit in lowering the risk of exposure and subsequent transmission of influenza in China.

History

Journal

Environment International

Volume

98

Pagination

82 - 88

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0160-4120

eISSN

1873-6750

Language

eng

Publication classification

C1 Refereed article in a scholarly journal