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New ‘solid’ discovery about the effectiveness of Pfizer and Moderna vaccines before Omicron

The US Centers for Disease Control and Prevention (CDC) on March 18 announced the results of a new study on the effectiveness of an mRNA vaccine against the Omicron variant. These are the two main COVID-19 vaccines used in the US – the Pfizer/BioNTech vaccine and the Moderna vaccine.

According to this study, although the vaccine’s effectiveness against the risk of mild Omicron infection gradually decreased, the effectiveness against the risk of hospitalization and death remained high.

And those who received the third dose were the most protected.

Specifically, the study found that two doses of the mRNA vaccine were 79% effective in preventing death or mechanical ventilation during the Omicron wave in the US. Meanwhile, three doses of the vaccine were 94% effective.

Jeanne Marrazzo, director of the Department of Infectious Diseases at the University of Alabama at Birmingham, Alabama, USA, told The Washington Post about the study: “Anyone who’s skeptical needs to look at that number and think, ‘Okay, okay. , I’ll probably catch a cold and feel sick, but… I won’t have to be on a ventilator or die.”

The CDC study looked at COVID-19 cases at 21 hospitals in 18 US states between March 11, 2021 and January 24, 2022.

The study gives scientists a look at how the vaccine works against the Alpha, Delta and Omicron variants.

William Schaffner, an infectious disease specialist at Vanderbilt University Medical Center in the US, said the study was “solid” evidence that the vaccine is effective.

“This is solid information that underpins vaccination and booster recommendations – and the vaccine has worked for Omicron,” Schaffner told The Washington Post.

As Omicron weakened, the number of COVID-19 cases dropped dramatically in the US. But a sub-line of Omicron, BA.2, is causing a wave of cases in many other parts of the world.

This sub-line is also gradually replacing the original Omicron line in the US. Dr Antony Fauci, medical adviser to US President Joe Biden, told ABC News: “It’s not clear yet whether the Omicron substream will lead to another wave of cases, a small or even moderate wave. , because there’s a lot of other things going on.”

BA.2 shares many similarities with the original Omicron line, but appears to be more transmissible. Dr Fauci said his colleagues in the UK are seeing an increase in cases but not in intensive care. And the trajectory of the COVID-19 epidemic in the US is about 3 weeks behind that of the UK, according to experts.

(Source: The Week)

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