Fact-check: Can vaccinated people spread COVID-19?

President Joe Biden said that people should not spread the disease to anyone else.

PolitiFact's ruling was mostly false.

As President Joe Biden heads toward his second year in office, he faces the challenge of trying to convince millions of unvaccinated Americans to get the vaccine.

The Republican National Committee said that Biden has lied to Americans. Biden gave an interview to a Dayton, Ohio, TV station in December.

Biden said in the full interview that this is a vaccine-related epidemic. The unvaccinated. The unvaccinated. That is the problem. Everyone talks about freedom and not having a test. Guess what? What about patriotism? Make sure that you get the vaccine so you don't spread the disease to anyone else.

Biden said in October that people who are vaccined for the coronaviruses cannot spread it to you. The risk of spreading the virus wasn't zero, despite the fact that studies showed a vaccine was less likely to spread it. Biden said it was Half True. The World Health Organization named the omicron variant a variant of concern.

President Joe Biden said that people should get vaccinations so they don't spread the disease.

Tara C. Smith, a Kent State University epidemiologist, told us at the time that vaccinations do reduce transmission from vaccine breakthrough cases but do not completely eliminate it.

A reader flagged Biden's recent comments and asked us to look at them. We wanted to revisit the question of whether or not people who arevaccinated can spread the disease.

We contacted experts to see if their understanding of the vaccine role has changed. There is not enough data on how many people caught COVID-19 from an unvaccinated person.

Bill Hanage, associate professor of epidemiology at Harvard, said Biden's December statement is not accurate.

Hanage said that they knew that people who were vaccine-vaccinated could become infectious with the delta and shed the viable virus in large amounts. This appears to be even more the case for that variant, as data is emerging and not yet complete for omicron.

Evidence shows that vaccinations help protect people from serious cases, including hospitalization and death. We found that Biden was wrong when he said that a vaccine-vaccinated person couldn't spread the virus. The new variant made experts more concerned about the accuracy of Biden's statement.

We asked the White House to give us Biden's evidence, but they didn't reply.

The risk of transmission is not eliminated by vaccine.

There was some hope that the omicron variant may cause a more mild disease than the earlier versions, but many patients in South Africa were younger and less likely to develop a severe illness. The seriousness of the infections is still up in the air because of a lot of issues, according to Dr. Anthony Fauci, the chief medical adviser to the president.

Heather Scobie, an epidemiologist at the CDC, wrote in a presentation that it is not yet known how easy omicron is to spread. It is likely that people with breakthrough infections and people without symptoms can spread the virus to others. The CDC made a similar statement in August.

The CDC expects anyone with omicron infection to spread the virus to others even if they are not sick, according to a page on the website.

We read recent statements by Biden administration officials promoting vaccinations, but none went as far as Biden to suggest that vaccination completely eliminated the chance of transmission. The director of the CDC told reporters that people who are vaccine-vaccinated should take precautions to reduce the spread of the disease.

John P. Moore, a professor of microbiology and immunology at Weill Cornell Medicine, said that there is evidence that people who have received omicron vaccine can spread infections to other people.

There are a few papers, mostly out of the U.K., on this point, but that is true on an anecdotal level. He said that the spread of infections is less likely when the person isvaccinated.

I would expect that the vaccines are not perfect for omicron. Moore said that Biden would have been on the right track if he had said "Make sure you're vaccine free."

People who are vaccinated are more protected.

Dr. Paul Offit, director of the Vaccine Education Center and an attending physician in the Division of Infectious Diseases at Children's Hospital of Philadelphia, said that Biden is correct that COVID-19 is a disease of the unvaccinated.

People who arevaccinated can shed virus and be contagious, but they generally shed virus in lower quantities and for a shorter amount of time. A study from Singapore found that people who caught COVID-19 had a more rapid decline in viral load, which has implications on secondary transmission and public health policy. The study was done before omicron emerged.

Brooke Nichols, a health economist and infectious disease mathematical modeler at Boston University, said "vaccinated individuals can definitely transmit other people's diseases." There is enough data to support this.

"While vaccine recipients may be less infectious for a shorter period of time, they are not dead-end hosts," he said. It makes sense that those who are unvaccinated aren't contributing to new cases when it's called a Pandemic of the Unvaccinated. Unvaccinated individuals contribute disproportionately to hospitalizations and deaths.

"I don't think the data systems in place can tell us anything about the proportion of new infections that came from unvaccinated people."

We asked professors if they could draw conclusions from Cornell University, which is having an outbreak even though 99% of the students are vaccine free. Is that a sign that people are spreading the disease?

Moore pointed to an article in the student newspaper about the spike of cases in December and said that your statement was a reasonable inference. I'm not saying that's not happening, only that I haven't seen formal studies yet.

Our ruling.

Biden said that people who have been vaccined do not spread the disease to others.

The White House did not respond to our email asking for evidence, but Biden's statement conflicts with the CDC's belief that people with no symptoms can spread the disease. The information from the CDC presentation is similar to what the CDC said in August about the potential for vaccine recipients to transmit the virus.

Biden went too far when he suggested that vaccination completely eliminates the chance of transmission, despite experts telling us that getting vaccine protects individuals from severe cases.

This statement is mostly false.

Sources.

RNC Research is on social media. Dec. 16, 2021.

News Center 7 talks one-on-one with President Joe Biden.

The White House is holding a press conference by the White House COVID-19 Response Team and Public Health Officials.

The update on omicron variant was published by the U.S. Centers for Disease Control and Prevention.

The U.S. Centers for Disease Control and Prevention has an Omicron variant.

A multi-center cohort study of the vaccine-breakthrough infections of the Delta variant of the SARS-CoV-2.

More than 900 Covid-19 cases have been reported by CNN and Cornell University. There are many Omicron variant cases in fully vaccineed students.

Changes to exams and alert level red are part of the Cornell University COVID-19 Update.

Joe Biden overstates how well vaccines prevent person-to-person virus spread.

Email interview with Rebecca Valli, Cornell University spokesman.

Email interview with John P. Moore, a professor of immunology and microbiology.

Email interview with Paul Offit, director of the Vaccine Education Center and an attending physician in the Division of Infectious Diseases at Children's Hospital of Philadelphia.

Bill Hanage is an associate professor of epidemiology at the Harvard T.H. School of Public Health.

Email interview with Brooke Nichols, assistant professor of global health at Boston University.

The Austin American-Statesman ran a fact-check on vaccine safety.

Fort Myers Scripps is on the air.

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