Research has focused on those immunized with messenger RNA vaccines in the United States.
Three large studies published this Friday by the United States Centers for Control and Prevention (CDC) confirm that the best protection against the omicron variant of the coronavirus is the booster dose of the vaccines against covid-19.
The investigations have focused on those immunized with RNA-messenger vaccines from Pfizer and Moderna in the US and who have received the booster dose.
According to one such analysis, which sampled nearly 88,000 hospitalized patients in 10 US states, the booster dose was effective by 90% in avoiding hospital admissions in December and January, months in which omicron has become prevalent in the US.
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Against these data, receiving two doses had an effectiveness of 57% after 6 months of having received the second.
In addition, the booster shot was a 82% effective in preventing visits to the ER, compared to 38% in those who had received two doses and after six months had passed after the second, indicates the study, which reviewed more than 200,000 visits in ten states.
The other CDC study concluded that people who have received three doses are less likely to be infected with omicron.
CDC researchers found with this analysis, conducted with data from 25 states and local health departments, that among those who received the booster vaccine, there are 149 weekly cases of covid per 100,000 people, compared to 255 for each 100,000 among those who received two doses.
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A third CDC study, cited by CNN and to be published by the medical journal JAMA, showed that the third dose helps prevent people from getting omicron.
The research focused on 13,000 cases of omicron and found that the chance of developing a symptomatic infection is 66% lower for those who have received the third dose compared to those who have only received two.
The director of the CDC, Rochell Walensky, spoke of these three investigations at the press conference of the White House team against the pandemic and summarized that “those who remain unvaccinated are at greater risk of infection and serious illness from covid-19″.
In addition, “protection against infection and hospitalization with the omicron variant is greater in those who are up to date with vaccination, that is, those who have received the third dose when it is their turn,” he indicated.
In that sense, he regretted that there are still millions of people who have not received the booster dose and can do so, when omicron already accounts for 99% of all cases in the US.
Therefore, “I urge all those who are eligible to receive the booster dose to do so as soon as possible,” he encouraged. (I)
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