FILE - In this Feb. 7, 2018 file photo, a nurse prepares a flu shot at the Salvation Army in Atlanta. On Friday, May 17, 2019, The Associated Press has found that stories circulating on the internet that mandatory flu or pneumococcal vaccinations are a requirement under the Affordable Care Act, are untrue. (AP Photo/David Goldman, File)

No evidence to link flu vaccinations to increased COVID-19 risk, say experts

AAP FactCheck August 14, 2020

The Statement

A Facebook post claims medical studies show the flu vaccination will increase a person’s susceptibility to COVID-19 and could be “contributing to the outbreak”.

The post features an image of US Congress with text overlaid which reads, “Medical studies showing the flu shot not only increases susceptibility to the Corona Virus but could be contributing to the outbreak”.

The post’s caption asks, “Wait, what? Not another conspiracy theory being validated?”

The caption links to a website called Australian National Review which features a response by a “retired paediatrician from New York” on the risk of being more susceptible to coronavirus infections from the flu shot.

The August 9 post has received more than 270 shares and more than 27,000 views.

A Facebook post
┬áA post claims studies show the flu shot will increase a person’s susceptibility to COVID-19.┬á

The Analysis

The post falsely claims medical studies show the flu shot increases the risk of testing positive for COVID-19. There is no evidence to support the claim, according to the Centers for Disease Control and Prevention (CDC) and two experts contacted by AAP FactCheck. Influenza and COVID-19 are caused by different viruses and flu vaccines contain attenuated or killed influenza viruses which won’t give people COVID-19 or make them more susceptible.

The post’s claim is from the website Australian National Review which republished a comment on an editorial in the British Medical Journal from February 2020.

Responding to Public Health Wales’ consultant epidemiologist John Watkins’ editorial on other methods to control COVID-19 outbreaks, Allan S. Cunningham, a retired paediatrician from New York, said there is a “possibility that seasonal flu shots are potential contributors to the current outbreak”.

Cunningham cited a study published in 2012 of a trial which examined whether 115 children vaccinated with the 2008-09 influenza vaccine had a higher chance of being infected with other respiratory diseases.

He claimed from the trial “flu shots increased fivefold the risk of acute respiratory infections caused by a group of non-influenza viruses, including coronaviruses”.

The CDC stated in April 2020 there is no evidence that “getting a flu vaccine increases the risk of getting COVID-19”. The CDC’s advice is supported by NSW Health who state there is “no evidence yet directly linking flu vaccination with an increased risk of COVID-19”.

In August 2020, the CDC said in an article titled, “Misconceptions about Seasonal Flu and Flu Vaccines” that flu vaccines are “not thought to make people more susceptible to other respiratory infections”.

The CDC referred to the flu vaccination study published in 2012 and concluded: “It’s not clear why this finding was detected in the one study, but the majority of evidence suggests that this is not a common or regular occurrence and that flu vaccination does not, in fact, make people more susceptible to other respiratory infections,” it said.

Professor Robert Booy, an infectious diseases paediatrician from the University of Sydney, told AAP FactCheck via email there is no evidence that the flu vaccine increases a person’s risk of COVID-19.

“These viruses are completely different from each other and there’s no reason biologically or, theoretically, to believe that giving one vaccine will increase the risk of another disease,” he said.

Associate Professor Margie Danchin, a vaccine researcher from Murdoch Children’s Research Institute and the University of Melbourne, told AAP FactCheck: “You can’t get the flu from the influenza vaccine. You certainly can’t get coronavirus from a killed influenza vaccine.”

She said the study published in 2012 was a “very small study to be drawing such large conclusions”.

“There’s no relationship really that can be drawn from this study to the COVID-19 situation whatsoever.”

Prof Booy agreed and told AAP FactCheck the study was conducted nearly 10 years ago and “is quite different from the COVID-19 (coronavirus) and has absolutely no relevance to the present day”.

Dr Danchin said the study was investigating a phenomenon called “viral interference” to examine whether boosting the body’s immunity against one type of virus will change the body’s ability to effectively respond to other types of viruses.

“The study says there was only one coronavirus infection detected, and it was called NL63, which has no relationship to the current coronavirus. Making a connection to COVID-19 from this paper is impossible,” she said.

Prof Booy described the study as an “outlier”, saying there needed to be confirmation from “two or three other studies before you’d be worried”.

A nurse prepares a flu shot.
┬áAn infectious diseases expert told AAP FactCheck there’s no evidence that a flu shot raises a person’s risk of COVID-19.┬á

The Verdict

Based on the evidence, AAP FactCheck found the Facebook post to be false. The US Centers for Disease Control and Prevention (CDC) said the 2012 flu vaccination study referred to in the post did not make people more susceptible to other respiratory infections. A vaccine researcher from the University of Melbourne and an infectious diseases paediatrician from the University of Sydney told AAP FactCheck that making a connection to COVID-19 from the study was impossible.

False – The claims in the post are factually inaccurate.

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