Saturday, May 21, 2022

Vaccination plus infection provided most protection during delta surge, US study shows. CBC News

According to a report published by the US Centers for Disease Control and Prevention (CDC) on Wednesday, protection against the pre-dominant delta variant was highest among those who had been vaccinated and those with a previous COVID-19 infection. were saved.

The report also found that people who had previously been infected with COVID-19 were better protected against the delta variant than those who were vaccinated alone, suggesting that natural immunity was better than vaccines against that variant. The more powerful was the shield, health officials in California and New York reported on Wednesday.

The CDC report continued, protection against Delta was lowest among people who had never been infected or vaccinated.

“The evidence in this report does not change our vaccination recommendations,” Dr. Ben Silk of the CDC and one of the study’s authors said at a media briefing.

“We know that vaccination is still the safest way to protect yourself from COVID-19,” he said.

The findings do not apply to the Omicron version of the virus, which now accounts for 99.5 percent of COVID-19 cases in the United States.

The study includes data from May to November.

For the study, health officials in California and New York collected data from May to November, which includes the period when the delta variant was dominant.

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This showed that people who had survived a previous infection had lower rates of COVID-19 than those who were vaccinated alone.

Silk told the briefing that this represents a change from the period when the alpha version was dominant.

“Prior to the delta version, COVID-19 vaccination resulted in better protection against subsequent infections than avoidance of previous infections,” he said.

In the summer and fall of 2021, however, when Delta became the major circulating iteration of the virus in the United States, “avoidance from previous infection now provided greater protection against subsequent infection than vaccination,” he said. .

But gaining immunity through natural infection carries significant risks. According to the study, as of November 30, 2021, approximately 130,781 residents of California and New York had died of COVID-19.

The analysis did not include information on the severity of the initial infection, nor does it account for the full range of disease caused by prior infection.

An important limitation to the study was that it was finished before the administration of vaccine booster doses became widespread.

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The safe science behind COVID-19 booster shots

While some Canadians who have received their booster shots have since tested positive for COVID-19, medical experts agree that the science behind booster jabs is sound. 1:55

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Vaccines ‘clearly show’ offer the safest protection

Dr. Erica Pan, state epidemiologist for the California Department of Public Health, said in an email that the study “clearly shows” that vaccines provide the safest protection against COVID-19 and that they provide additional protection for people with prior infection. provide.

“Outside of this study, recent data on the highly infectious Omicron variant suggests that receiving a booster provides significant additional protection against infection, hospitalization, and death,” Pan said.

Silk said CDC is studying the impact of vaccinations, boosters and pre-infections during the Omicron boom and expects to release further reports when this data becomes available.

So far, Omicron has been proven to ward off some level of immunity from both vaccination and past infection, but vaccines still largely prevent serious disease and death.

An Israeli hospital also said Monday that preliminary research indicates that a fourth dose of pioneering mRNA-based vaccines provides only limited defense against infection from the variant.

Nation World News Desk
Nation World News Desk
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