CDC: Seasonal Flu Cases Increasing in USA; Most Among Children and Young Adults

By Susan Jones | December 28, 2021 | 10:12am EST
(Photo by Smith Collection/Gado/Getty Images)
(Photo by Smith Collection/Gado/Getty Images)

( - "Seasonal influenza activity in the United States is increasing, including indicators that track hospitalizations. The amount of activity varies by region," the federal Centers for Disease Control and Prevention says on its flu-tracker web page.

CDC says the eastern and central parts of the country seeing the largest increases in flu cases, based on data available through December 18.

And unlike COVID, flu puts young children at high risk: "Most influenza A(H3N2) infections have occurred among children and young adults ages 5-24 years; however, the proportion of infections occurring among adults age 25 years and older has been increasing," CDC said in its most recent update.

"The first two influenza-associated pediatric deaths this season were reported this week" [week 50 out of 52], CDC said. "Both cases were associated with influenza-A virus infections."

Pediatric COVID deaths vs. flu deaths

CDC says 668 children, ages 0-17, have died of COVID-involved illness since the start of the pandemic in January 2020, almost two years ago. Those 668 children, most with underlying conditions, represent less than one percent, or 0.0826 percent, of the total 807,774 people who have died of COVID so far in the United States.

By contrast, 434 children ages 0-17 died in the 2019-2020 flu season, or 1.98 percent of the total 21,909 flu deaths in that one year. In the 2018-2019 flu season, 372 children ages 0-17 died of flu, or 1.697 percent of the total 27,619 people who died in the U.S. that year.

So in those two years, more young children (806) died of flu – or 20.65 percent more than the 668 who have died of COVID in almost two years.

(Flu activity was unusually low throughout the 2020-2021 flu season because of COVID mitigation measures.)

According to CDC: "Although all children younger than 5 years old are considered at higher risk of serious flu complications, the highest risk is for those younger than 2 years old, with the highest hospitalization and death rates among infants younger than 6 months old.

The good news is, vaccines are available for all but the youngest infants, as noted above. But CDC says based on the data available so far, the H3N2 viruses have continued to evolve, meaning the vaccines may have limited efficacy.

Other notes from CDC's weekly flu activity tracker:

-- The percentage of outpatient visits due to respiratory illness is trending upwards and is above the national baseline. Influenza is contributing to levels of respiratory illness, but other respiratory viruses are also circulating. The relative contribution of influenza varies by location.

-- Hospitalizations for influenza are starting to increase.

-- The flu season is just getting started. There’s still time to get vaccinated. An annual flu vaccine is the best way to protect against flu and its potentially serious complications. CDC recommends everyone 6 months and older get a flu vaccine.

-- There are early signs that flu vaccination uptake is down this season compared to last. (Uptake is the proportion of a population that has received a specific vaccine, in this case, the flu vaccine.)

-- Flu vaccines are available at many different locations, including pharmacies and health departments. With flu activity just getting started, there is still time to benefit from flu vaccination this season. Visit to find a flu vaccine near you.

-- There are also flu antiviral drugs that can be used to treat flu illness.

CDC recommends a yearly flu vaccine for everyone ages six months and older, starting in October. Pregnant women should get a flu vaccine to protect both the mother and her baby from flu.

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