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Asia Pac J Public Health. 2012 Nov;24(6):932-9. doi: 10.1177/1010539511408285. Epub 2011 May 5.

The characteristics of imported cases and the effectiveness of outbreak control strategies of pandemic influenza A (H1N1) in China.

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Beijing Center for Disease Prevention and Control (CDC) and Capital Medical University School of Public Health and Family Medicine (CMU SPHFM), China.


The aim of this article was to describe the epidemiological characteristics of imported cases of pandemic influenza A (H1N1) and to assess the effectiveness of public health intervention measures in Beijing, China. Data on imported cases were collected via border entry screening, influenza-like illness screening in hospitals, medical follow-up of travelers from overseas, and quarantined close contacts. The characteristics of these cases were investigated. Pharyngeal swabs were collected and tested using polymerase chain reaction. A total of 609 imported cases were confirmed in Beijing from May 16 to September 30, 2009. Subjects aged <20 years accounted for 47.3%, and females represented 49.1%. Most cases were from North America and South America (27.3%). There were 21.8%, 18.7%, 3.1%, and 56.3% of cases detected separately via border entry screening, quarantined close contacts, medical follow-up of travelers from overseas, and influenza-like illness screening in hospitals, respectively. The 4 strategies were able to detect the cases efficiently but the use of resources was high.

[Indexed for MEDLINE]

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