Booster Shots Are Effective Against harsh Illness From Omicron, CDC S…

Booster Shots Are Effective Against harsh Illness From Omicron, CDC S…

Three studies released Friday offered more evidence that COVID-19 vaccines are standing up to the omicron variant, at the minimum among people who received booster shots.

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

The papers echo past research — including studies in Germany, South Africa and the U.K. — suggesting obtainable vaccines are less effective against omicron than earlier versions of the coronavirus, but also that boosters considerably enhance protection.

The first study looked at hospitalizations and emergency room and urgent care center visits in 10 states, from August to this month.

It found vaccine effectiveness was best after three doses of the Pfizer or Moderna vaccines in preventing COVID-19-associated emergency department and urgent care visits. Protection dropped from 94% during the delta wave to 82% during the omicron wave. Protection from just two doses was lower, especially if six months had passed since the second measure.

The second study focused on COVID-19 case and death rates in 25 states from the beginning of April by Christmas. People who were boosted had the highest protection against coronavirus infection, both during the time delta was principal and also when omicron was taking over.

Those two articles were published online by the Centers for Disease Control and Prevention.

The Journal of the American Medical Association published the third study, also led by CDC researchers. 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. Two doses, however, offered no meaningful protection against omicron, the researchers found.

“It really shows the important of getting a booster measure,” said the CDC’s Emma Accorsi, one of the study’s authors.


The Associated Press Health & Science Department receives sustain from the Howard Hughes Medical Institute’s Department of Science Education. The AP is solely responsible for all content.

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