Distribution and risk factors of 2009 pandemic influenza A (H1N1) in mainland China.

ABSTRACT: Data from all reported cases of 2009 pandemic influenza A (H1N1) were obtained from the China Information System for Disease Control and Prevention. The spatiotemporal distribution patterns of cases were characterized through spatial analysis. The impact of travel-related risk factors on invasion of the disease was analyzed using survival analysis, and climatic factors related to local transmission were identified using multilevel Poisson regression, both at the county level. The results showed that the epidemic spanned a large geographic area, with the most affected areas being in western China. Significant differences in incidence were found among age groups, with incidences peaking in school-age children. Overall, the epidemic spread from southeast to northwest. Proximity to airports an

SUBMITTER: Fang LQ 

PROVIDER: S-EPMC3339311 | biostudies-literature | 2012 May

REPOSITORIES: biostudies-literature