Weekly Flu Report, December 10, 2021

Massachusetts Department of Public Health weekly influenza update

Table of Contents

This week's report


  • Influenza severity for Massachusetts is moderate this week.
  • The percent of influenza-like illness (ILI) visits in Massachusetts is 2.52%, which is above the regional baseline of 2.0% and higher than the three previous seasons in the same week.
  • The percent of hospitalizations associated with influenza is 0.28%, which is comparable to the previous three seasons in the same week.
  • Overall ILI activity is low. The Boston, Central, Outer Metro Boston, and Southeast regions are reporting moderate ILI activity, while all other regions are reporting low ILI activity.
  • More influenza A than influenza B positive specimens have been reported by hospitals and outpatient facilities in Massachusetts. For influenza A the predominant strain is currently H3N2.
  • Nationally, flu activity is low, but ILI activity and influenza virus detections by laboratories has increased in recent weeks.
  • Additional statewide and national data including geographic spread, ILI activity, and pneumonia and influenza mortality are available at CDC’s FluView Weekly Report at www.cdc.gov/flu/weekly and FluView Interactive https://www.cdc.gov/flu/weekly/fluviewinteractive.htm.
  • Statewide and national COVID data are available at

        https://www.mass.gov/info-details/covid-19-response-reporting and   


Flu season has begun and the best time to get your flu shot is now. Flu vaccination is always the best way to prevent flu and its potentially serious complications.

Additional Resources

Date published: December 10, 2021

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