Impact of meteorological and demographic factors on the influenza epidemic in Japan: a large observational database study.

ABSTRACT: Factors affecting the start date of the influenza epidemic season and total number of infected persons per 1,000,000 population in 47 prefectures of Japan were evaluated. This retrospective observational study (September 2014-August 2019; N = 472,740-883,804) evaluated data from a Japanese health insurance claims database. Single and multiple regression analyses evaluated the time to start of the epidemic or total infected persons per 1,000,000 population with time to absolute humidity (AH) or number of days with AH (≤ 5.5, ≤ 6.0, ≤ 6.5, and ≤ 7.0), total visitors (first epidemic month or per day), and total population. For the 2014/15, 2015/16, and 2016/17 seasons, a weak-to-moderate positive correlation (R²: 0.042-0.417) was observed between time to start of the epidemic and t

SUBMITTER: Ito G 

PROVIDER: S-EPMC10415347 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature