Influenza Division, US Centers for Disease Control and Prevention, Influenza Division, Atlanta, Georgia, USA.
J Infect Dis. 2012 Dec 15;206 Suppl 1:S101-7. doi: 10.1093/infdis/jis572.
To understand 2009 pandemic influenza A virus subtype H1N1 (A[H1N1]pdm09) circulation in West Africa, we collected influenza surveillance data from ministries of health and influenza laboratories in 10 countries, including Cameroon, from 4 May 2009 through 3 April 2010. A total of 10,203 respiratory specimens were tested, of which 25% were positive for influenza virus. Until the end of December 2009, only 14% of all detected strains were A(H1N1)pdm09, but the frequency increased to 89% from January through 3 April 2010. Five West African countries did not report their first A(H1N1)pdm09 case until 6 months after the emergence of the pandemic in North America, in April 2009. The time from first detection of A(H1N1)pdm09 in a country to the time of A(H1N1)pdm09 predominance varied from 0 to 37 weeks. Seven countries did not report A(H1N1)pdm09 predominance until 2010. Introduction and transmission of A(H1N1)pdm09 were delayed in this region.
为了了解 2009 年大流行性流感 A 型病毒 H1N1（A[H1N1]pdm09）在西非的传播情况，我们收集了来自 10 个国家（包括喀麦隆）卫生部和流感实验室的流感监测数据，时间从 2009 年 5 月 4 日至 2010 年 4 月 3 日。共检测了 10203 份呼吸道标本，其中 25%为流感病毒阳性。直到 2009 年 12 月底，所有检测到的菌株中只有 14%是 A（H1N1）pdm09，但从 2010 年 1 月至 4 月 3 日，这一频率增加到 89%。在 2009 年 4 月北美大流行出现后的 6 个月内，5 个西非国家才报告了首例 A（H1N1）pdm09 病例。从一个国家首次检测到 A（H1N1）pdm09 到 A（H1N1）pdm09 占优势的时间从 0 到 37 周不等。直到 2010 年，有 7 个国家才报告 A（H1N1）pdm09 占优势。A（H1N1）pdm09 在该地区的引入和传播出现了延迟。
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