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. 2013 Oct 25;62(42):838-42.

Update: influenza activity--United States and worldwide, May 19-September 28, 2013

Centers for Disease Control and Prevention

Update: influenza activity--United States and worldwide, May 19-September 28, 2013

Centers for Disease Control and Prevention. MMWR Morb Mortal Wkly Rep. .

Abstract

During May 19-September 28, 2013,* the United States experienced low levels of seasonal influenza activity overall. Influenza A (H1N1) pdm09 (pH1N1), influenza A (H3N2), and influenza B viruses were detected worldwide and were identified sporadically in the United States. In June, influenza A (H3N2) variant(†) viruses (H3N2)v were first detected in Indiana, and between June 18 and September 28, a total of 20 cases of influenza A variant viruses ([H3N2]v and influenza A (H1N1) variant [H1N1]v) were reported from five states. This report summarizes influenza activity in the United States and worldwide from May 19 through September 28, 2013.

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Figures

FIGURE
FIGURE
Number* and percentage of respiratory specimens testing positive for influenza reported by World Health Organization and National Respiratory and Enteric Virus Surveillance System collaborating laboratories in the United States, by type, subtype, and week — United States, May 19–September 28, 2013† * N = 2,013. † As of September 28, 2013.
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