receiving a covid-19 booster shot can reduce a person's risk of being hospitalized with the omicron variant by 90 percent, a new report from the centers for disease control and prevention.

They are the first large U.S. studies to look at vaccine protection against omicron, health officials said.

'All adults who have received mRNA vaccines during their primary COVID-19 vaccination series should receive a third dose when eligible, and eligible persons should stay up to date with COVID-19 vaccinations. '

The agency performed three separate studies to come to its conclusions.

The CDC study was based on data from 88,000 hospitalisations in 10 US states.

The numbers in the US are significantly lower despite an all-out push by health officials to get more residents boosted.

Pfizer's booster has also had its authorization extended to children aged 12 to 17- when it was previously only allowed for those 18 and older, but data on how many kids in the low-risk category have been boosted was not available on the CDC.

The researchers also found that those who have received their booster shot are 66% more likely to experience an asymptomatic Covid case. Pictured: A person in Los Angeles, California, receives a shot of a COVID-19 vaccine on January 19

Booster doses of the Pfizer and Moderna vaccines offer improved protection against hospitalisations due to Covid-19 variants, new studies show.

Protection from just two doses was lower, especially if six months had passed since the second dose.

A second CDC study, also released on Friday, examined data from 25 state and local health departments and found that people with booster shots are significantly less likely to get infected with Omicron.

The research found that among boosted patients, there were an average of 149 cases per 100,000 people, compared to 255 among those who had so far only had two doses.

A CDC research team found that people who have received their Covid booster shot are 90% less likely to require hospitalization when infected with the Omicron variant than their unvaccinated peers. Pictured: Health care workers treat a Covid patient in a

The Journal of the American Medical Association published the third study, also led by CDC researchers.

Earlier this week, US President Joe Biden was asked why the definition of 'fully vaccinated' had yet to be changed to mean three shots, rather than two.

"You are better protected with the booster shot," he answered.

"It's all part of the same thing."

in that same age group experienced a rate of covid-related hospitalization.

According to the CDC, adults who are 65 and older and have received both doses of either the Pfizer or Moderna vaccine showed a 94 % reduced risk of Covid-related hospitalizations.

"Get vaccinated as soon as possible," the agency added.

Protection dropped from 94 % during the delta wave to 82 % during the omicron wave.

The second study focused on COVID-19 case and death rates in 25 states from the beginning of April through Christmas.

It looked at people who tested positive for COVID-19 from Dec. 10 to Jan. 1 at more than 4,600 testing sites across the U.S. Three shots of the Pfizer and Moderna vaccines were about 67 % effective against omicron-related symptomatic disease compared with unvaccinated people.

"It really shows the important of getting a booster dose," said the CDC's Emma Accorsi, one of the study ’ s authors.

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