Update: Influenza Activity - United States and Worldwide, May 21-September 23, 2017.

Update: Influenza Activity - United States and Worldwide, May 21-September 23, 2017. MMWR Morb Mortal Wkly Rep. 2017 Oct 06;66(39):1043-1051 Authors: Blanton L, Wentworth DE, Alabi N, Azziz-Baumgartner E, Barnes J, Brammer L, Burns E, Davis CT, Dugan VG, Fry AM, Garten R, Grohskopf LA, Gubareva L, Kniss K, Lindstrom S, Mustaquim D, Olsen SJ, Roguski K, Taylor C, Trock S, Xu X, Katz J, Jernigan D Abstract During May 21-September 23, 2017,* the United States experienced low-level seasonal influenza virus activity; however, beginning in early September, CDC received reports of a small number of localized influenza outbreaks caused by influenza A(H3N2) viruses. In addition to influenza A(H3N2) viruses, influenza A(H1N1)pdm09 and influenza B viruses were detected during May-September worldwide and in the United States. Influenza B viruses predominated in the United States from late May through late June, and influenza A viruses predominated beginning in early July. The majority of the influenza viruses collected and received from the United States and other countries during that time have been characterized genetically or antigenically as being similar to the 2017 Southern Hemisphere and 2017-18 Northern Hemisphere cell-grown vaccine reference viruses; however, a smaller proportion of the circulating A(H3N2) viruses showed similarity to the egg-grown A(H3N2) vaccine reference virus which represents the A(H3N2) viruses used for the majorit...
Source: MMWR Morb Mortal Wkl... - Category: Epidemiology Authors: Tags: MMWR Morb Mortal Wkly Rep Source Type: research