Japanese Journal of Infectious Diseases
Online ISSN : 1884-2836
Print ISSN : 1344-6304
ISSN-L : 1344-6304
Original Article
Effect of Climatic Conditions on Epidemic Patterns of Influenza in Okinawa, Japan, during the Pandemic of 2009: Surveillance of Rapid Antigen Test Results
Yoshikazu IhaFutoshi HigaSatoko SunagawaMasamitsu NakaHaley L. CashKazuya MiyagiShusaku HaranagaMasao TateyamaTsukasa UnoJiro Fujita
ジャーナル フリー

2012 年 65 巻 4 号 p. 295-300


Climatic conditions may have affected the incidence of influenza during the pandemic of 2009 as well as at other times. This study evaluated the effects of climatic conditions on influenza incidence in Okinawa, a subtropical region in Japan, during the 2009 pandemic using surveillance data from rapid antigen test (RAT) results. Weekly RAT results performed in four acute care hospitals in the Naha region of the Okinawa Islands from January 2007 to July 2011 were anonymously collected for surveillance of regional influenza prevalence. Intense epidemic peaks were noted in August 2009 and December 2009–January 2010 during the influenza pandemic of 2009. RAT positivity rates were lower during the pandemic period than during the pre- and post-pandemic periods. Lower ambient temperature was associated with higher influenza incidence during pre- and post-pandemic periods but not during the pandemic of 2009. Lower relative humidity was associated with higher influenza incidence during the pandemic as well as during the other two periods. The association of climatic conditions and influenza incidence was less prominent during the pandemic of 2009 than during pre- and post-pandemic periods.

© Authors
前の記事 次の記事