Vaccines Offer More Protection Against Covid Than Prior Infection, CDC Study Suggests

Vaccinated Americans were less likely to test positive for Covid-19 than people who had “natural immunity” from a previous infection, according to a Friday study from the Centers for Disease Control and Protection, adding yet another data point to the investigation into whether vaccines or prior Covid-19 cases are a better defense against the virus.

The study looked at thousands of U.S. adults who were hospitalized with Covid-like symptoms in the first nine months of 2021, and either had a prior coronavirus infection three to six months beforehand or took a Pfizer or Moderna vaccine over that timeframe.

The unvaccinated and previously infected group was 5.49 times more likely to test positive for the virus again than the vaccinated and uninfected group, the CDC said, after adjusting results for age, region, time and Covid-19 prevalence in the local area.

Vaccinated people had better odds than patients with prior infections both before and after the coronavirus’ more contagious delta variant began gripping the country in June.

These results line up with a smaller August CDC study that found vaccinated Kentucky residents were 2.34 times less likely to be reinfected with the coronavirus than unvaccinated people in May and June, the CDC noted.

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