Home Health News Fact check: Flu vaccine hasn't eradicated the flu, but it has lessened the burden of the virus – USA TODAY

Fact check: Flu vaccine hasn't eradicated the flu, but it has lessened the burden of the virus – USA TODAY

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The claim: The flu is still around, despite a vaccine

A post on Facebook claims the flu vaccine has been ineffective in eradicating the virus, despite existing for nearly eight decades.

“We’ve had a flu vaccine for 78 years,” the image reads. “We still have the flu.”

The black-and-white photo accompanying the text, though, is of a child receiving one of the first free polio vaccines in St. Louis in April 1955, according to the St. Louis Post-Dispatch.

The image was posted by GZA, a rapper and a founding member of the Wu-Tang Clan. 

GZA directed USA TODAY to a timeline from the Centers for Disease Control and Prevention on the flu pandemic from 1930 until today, and said he was focused on “the information in the post” rather than the associated photograph of the polio vaccine.

More: The flu shot: How effective is it? Here’s what doctors say

The flu vaccine was created 78 years ago, but the virus is constantly changing

The CDC’s timeline shows the first influenza vaccine was produced in 1942, and licensed for use in civilians in 1945 — 75-78 years ago.

By 1947, though, scientists realized the composition of the influenza virus had changed, rendering the existing vaccine ineffective. 

The “recurring mutations” of the influenza virus make it impossible to vaccinate against every strain of the flu. Each season’s flu shot is actually composed of “the most frequent strains isolated in the previous season,” according to a study in the Journal of Preventative Medicine and Hygiene. 

Fact check: 2009 swine flu spread rapidly, but COVID-19 is more deadly

Sometimes, the previous season’s strains are a close match with the upcoming season’s strains — and sometimes, they’re not. That impacts effectiveness.

Recent studies show that vaccination reduces the risk of illness by between 40% and 60% when the flu viruses circulating are well-matched to the vaccine, per the CDC.

Though it’s true that the influenza vaccine has not eradicated the flu, it has lessened the burden of the virus on the United States. 

For example, in the 2017-2018 flu season, vaccination prevented approximately 6.2 million illnesses, 3.2 million medical visits, 91,000 hospitalizations and 5,700 deaths, according to estimates from the CDC.

Accordingly, the CDC recommends that everyone over the age of 6 months receive annual flu vaccinations, except in “uncommon” cases of allergies or specific health histories.

Most experts agree that it’s worthwhile to get the shot.

Fact check: CDC did not add flu and pneumonia cases to its COVID-19 death count

Vaccines have eradicated other diseases, like polio, from the country

The photo in the post depicts a child being vaccinated against polio, not the flu. Notably, polio is an example of a disease that has been eradicated in the United States as a result of vaccines.

In the early 1950s, polio outbreaks caused over 15,000 cases of paralysis each year, according to the CDC.

More: Need Clorox wipes? Disinfecting wipes shortage could last into 2021 amid coronavirus pandemic

After vaccines were discovered in 1955 and 1963, though, the number of cases fell rapidly, to fewer than 100 in the 1960s and fewer than 10 in the 1970s. In fact, the last case of polio that originated in the U.S. was in 1979, and there is “no year-round transmission of poliovirus in the United States,” per the CDC.

Other diseases that have been nearly eradicated in the United States include diphtheria, bacterial influenza, measles, mumps, rubella, and tetanus, according to Vox.

Worldwide, just two diseases — smallpox and rinderpest, a disease that affects cattle — have been wiped out.

Fact check: Masks can keep out COVID-19 particles even though smaller than dry wall dust

Our rating: Missing context

Based on our research, the claim that the influenza virus still exists almost eight decades after the discovery of a vaccine is MISSING CONTEXT. It’s true that the flu still exists — but there never was just one strain to eradicate, and the vaccine still significantly lessens the burden of influenza on the United States each flu season.  

Our fact-check sources:

  • St. Louis Post-Dispatch, April 21, 2020, The arrival of the first polio vaccine in St. Louis in 1955 was greeted with relief
  • Centers for Disease Control and Prevention, Influenza Historic Timeline
  • Journal of Preventative Medicine and Hygiene, September 2016, History and evolution of influenza control through vaccination: from the first monovalent vaccine to universal vaccines
  • Centers for Disease Control and Prevention, Vaccine Effectiveness: How Well Do the Flu Vaccines Work?
  • Centers for Disease Control and Prevention, 2017-2018 Estimated Influenza Illnesses, Medical visits, Hospitalizations, and Deaths Averted by Vaccination in the United States
  • Centers for Disease Control and Prevention, Who Should and Who Should NOT get a Flu Vaccine
  • MakeItGrateful.com, Nov. 7, 2019, The flu shot: How effective is it? Here’s what doctors say
  • Centers for Disease Control and Prevention, Polio Elimination in the United States
  • Vox, Aug. 25, 2016, What diseases have vaccines eradicated?

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Our fact check work is supported in part by a grant from Facebook.

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