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Influenza Activity in Massachusetts

UPDATED: March 30, 2020

CDC estimates that so far this season there have been at least 39 million flu illnesses, 400,000 hospitalizations and 24,000 deaths from flu.

National Influenza Activity:
According to this week’s FluView report, laboratory confirmed flu activity as reported by clinical laboratories continues to decrease; however, influenza-like illness activity is increasing. Influenza severity indicators remain moderate to low overall, but hospitalization rates differ by age group, with high rates among children and young adults.
 
Viral Surveillance - Clinical Lab: The percentage of respiratory specimens testing positive for influenza at clinical laboratories decreased from 14.9% last week to 6.9% this week.
 
Viral Surveillance - Public Health Lab: Nationally, influenza A(H1N1)pdm09 viruses are now the most commonly reported influenza viruses this season.
 
Virus Characterization and Antiviral Resistance: Genetic and antigenic characterization and antiviral susceptibility of influenza viruses collected in the U.S. this season is summarized in the CDC FluView report.
 
Outpatient Illness - ILI Net: Visits to health care providers for influenza-like illness (ILI) increased from 5.6% last week to 6.4% this week. All regions are above their baselines.

Outpatient Illness- ILINet Activity Map: The number of jurisdictions experiencing high ILI activity decreased from 40 last week to 37 this week.
 
Geographic Spread of Influenza: The number of jurisdictions reporting regional or widespread influenza activity decreased from 50 last week to 49 this week.
 
Influenza-associated Hospitalizations: The overall cumulative hospitalization rate for the season increased to 67.3 per 100,000.
 
Pneumonia and Influenza Mortality: The percentage of deaths attributed to pneumonia and influenza is 7.4%, above the epidemic threshold of 7.3%.
 
Influenza-associated Pediatric Deaths: 6 influenza-associated pediatric deaths occurring during the 2019-2020 season were reported this week. The total for the season is 155.

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