tailieunhanh - Báo cáo y học: "Aerosol influenza transmission risk contours: A study of humid tropics versus winter temperate zone"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Aerosol influenza transmission risk contours: A study of humid tropics versus winter temperate zone | Hanley and Borup Virology Journal 2010 7 98 http content 7 1 98 lỆm VIROLOGY JOURNAL RESEARCH k__ Open Access Aerosol influenza transmission risk contours A study of humid tropics versus winter temperate zone Brian P Hanley 1 and Birthe Borup2 Abstract Background In recent years much attention has been given to the spread of influenza around the world. With the continuing human outbreak of H5N1 beginning in 2003 and the H1N1 pandemic in 2009 focus on influenza and other respiratory viruses has been increased. It has been accepted for decades that international travel via jet aircraft is a major vector for global spread of influenza and epidemiological differences between tropical and temperate regions observed. Thus we wanted to study how indoor environmental conditions enclosed locations in the tropics and winter temperate zones contribute to the aerosol spread of influenza by travelers. To this end a survey consisting of 632 readings of temperature T versus relative humidity RH in 389 different enclosed locations air travelers are likely to visit in 8 tropical nations were compared to 102 such readings in 2 Australian cities including ground transport hotels shops offices and other publicly accessible locations along with 586 time course readings from aircraft. Results An influenza transmission risk contour map was developed for T versus RH. Empirical equations were created for estimating 1. risk relative to temperature and RH and 2. time parameterized influenza transmission risk. Using the transmission risk contours and equations transmission risk for each country s locations was compared with influenza reports from the countries. Higher risk enclosed locations in the tropics included new automobile transport luxury buses luxury hotels and bank branches. Most temperate locations were high risk. Conclusion Environmental control is recommended for public health mitigation focused on higher risk enclosed locations. Public health can make use