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Update: Influenza Activity - United States, October 2, 2016-February 4, 2017

Lenee Blanton1, Desiree Mustaquim1, Noreen Alabi1

  • 1Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.

MMWR. Morbidity and Mortality Weekly Report
|February 17, 2017
PubMed

Insights

US influenza activity increased in mid-December 2016 and remained high through February 2017. Influenza A (H3N2) viruses were the most common, though other influenza A and B strains were also detected.

Area of Science:

  • Epidemiology
  • Virology
  • Public Health

Background:

  • Influenza surveillance is crucial for monitoring seasonal and pandemic threats.
  • Understanding the predominant strains and activity patterns informs public health interventions.

Purpose of the Study:

  • To summarize U.S. influenza activity from October 2, 2016, to February 4, 2017.
  • To identify the dominant influenza virus strains circulating during this period.

Main Methods:

  • The study likely involved analyzing data from national influenza surveillance networks.
  • Virological testing was used to identify circulating influenza strains.

Main Results:

  • Influenza activity in the U.S. began increasing in mid-December 2016.
  • Activity remained elevated through February 4, 2017, with continued circulation expected.
  • Influenza A (H3N2) viruses predominated overall during this period.
  • Influenza A (H1N1)pdm09 and influenza B viruses were also identified.

Conclusions:

  • The 2016-2017 influenza season saw a significant increase in activity.
  • Influenza A (H3N2) was the primary driver of illness during the reported period.
  • Ongoing surveillance is necessary to track influenza trends and inform vaccination strategies.

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