Influenza Virus Transmission Is Dependent on Relative Humidity and Temperature

PLoS Pathogens

Samira Mubareka¹  John Steel¹  Anice C Lowen¹  Peter Palese¹ 

[1] Department of Microbiology, Mount Sinai School of Medicine, New York, New York, United States of America

关键词: Guinea pigs;    Influenza viruses;    Influenza;    Humidity;    Seasons;    Aerosols;    Immune response;    Hemagglutination inhibition test;   

DOI  :  10.1371/journal.ppat.0030151

学科分类：生物科学（综合）

来源: Public Library of Science

【 摘 要 】

Using the guinea pig as a model host, we show that aerosol spread of influenza virus is dependent upon both ambient relative humidity and temperature. Twenty experiments performed at relative humidities from 20% to 80% and 5 °C, 20 °C, or 30 °C indicated that both cold and dry conditions favor transmission. The relationship between transmission via aerosols and relative humidity at 20 °C is similar to that previously reported for the stability of influenza viruses (except at high relative humidity, 80%), implying that the effects of humidity act largely at the level of the virus particle. For infected guinea pigs housed at 5 °C, the duration of peak shedding was approximately 40 h longer than that of animals housed at 20 °C; this increased shedding likely accounts for the enhanced transmission seen at 5 °C. To investigate the mechanism permitting prolonged viral growth, expression levels in the upper respiratory tract of several innate immune mediators were determined. Innate responses proved to be comparable between animals housed at 5 °C and 20 °C, suggesting that cold temperature (5 °C) does not impair the innate immune response in this system. Although the seasonal epidemiology of influenza is well characterized, the underlying reasons for predominant wintertime spread are not clear. We provide direct, experimental evidence to support the role of weather conditions in the dynamics of influenza and thereby address a long-standing question fundamental to the understanding of influenza epidemiology and evolution.

【 授权许可】

CC BY