MMWR Morb Mortal Wkly Rep. 2008 Feb 22;57(7):179-83.
This report summarizes U.S. influenza activity since the beginning of the 2007-08 influenza season (September 30, 2007) and updates the previous summary. From September through early December, influenza activity remained low in the United States. Activity increased from early December through the end of the year and has continued to increase in January and February.
本报告总结了自2007-2008流感季开始（2007年9月30日）以来美国的流感活动情况，并更新了此前的总结。从9月到12月初，美国的流感活动一直处于低水平。从12月初到年底活动有所增加，在1月和2月继续上升。
