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. 2012 Oct 5;61(39):785-9.

Update: influenza activity - United States and worldwide, May 20-September 22, 2012

Centers for Disease Control and Prevention (CDC)
  • PMID: 23034586
Free article

Update: influenza activity - United States and worldwide, May 20-September 22, 2012

Centers for Disease Control and Prevention (CDC). MMWR Morb Mortal Wkly Rep. .
Free article

Abstract

During May 20-September 22, 2012, the United States experienced low levels of seasonal influenza activity overall; however, more seasonal influenza viruses were detected than in the summer months of previous years. Influenza A (H1N1)pdm09 (pH1N1), influenza A (H3N2), and influenza B viruses were detected worldwide and were identified sporadically in the United States. In July, influenza A (H3N2) variant viruses (H3N2v) were first detected in Indiana, and since July 12, a total of 306 cases have been reported from 10 states. This report summarizes influenza activity in the United States and worldwide since May 20, 2012.

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