The Centers for Disease Control and Prevention released a study on Wednesday showing that people with prior infections were less likely to catch the coronaviruses than people who only had immunity from an earlier case.
The Community Health Center in Los Angeles will be open on February 16, 2021.
Agence France-Presse via Getty Images.
The CDC looked at data from California and New York between May and November of 2021.
In New York and California, people with no previous coronaviruses infections had lower case rates than people with previous infections, according to the study.
By early October, New Yorkers and Californians who were both vaccine-vaccinated had lower case rates than unvaccinated people.
In the first full week of October, people who were unvaccinated but had previously been exposed to the Covid-19 virus were less likely to catch it than people who had not been exposed.
In October, California recorded a similar trend, and the CDC found that people who had been exposed to Covid-19 were less likely to be hospitalized.
The authors of the study said that vaccine remains the safest and primary strategy to prevent infections.
The impact of the omicron variant on people who have previously been exposed to coronaviruses is not known. Covid-19 booster shots are believed to prevent vaccine effectiveness from waning.
There is a key background.
More than two-thirds of eligible Americans are vaccine free against Covid-19, leaving tens of millions of people without immunity. Some people may be protected partially by prior Covid-19 infections. Two CDC studies from August and October found vaccines offered more protection than natural immunity, but a separate study from the U.K.'s Office of National Statistics last fall found vaccines and natural immunity were roughly equal. The August paper from Israel found that people who took one dose of Pfizer's vaccine after being exposed to the delta variant were more likely to catch it than people who had not been exposed. Last year, the Nature journal called this combination of vaccine and previous infections a "super-immunity", and some researchers have suggested that it could offer that. The CDC has urged people not to forgo the coronaviruses vaccines just because they have survived Covid-19.
It's called Tangent.
The Biden Administration's push to mandate vaccines in some workplaces doesn't give credit to people with immunity from prior infections, which is why conservatives like Florida Gov. Ron DeSantis argue that natural immunity has turned into a political lightning rod.
A CDC study suggests that vaccines offer more protection against covid than before.
Live updates on the coronaviruses.
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