Both vaccination and a prior infection provided protection against another infection and hospitalization due to COVID-19 during the United States' delta wave, according to a study released by the CDC.
Between May and November 2021, researchers analyzed data from New York and California to determine the impact of vaccination and previous COVID-19 infection on cases and hospitalization rates.
The analysis found that before delta became the predominant variant in June, vaccination offered better protection against breakthrough infections than prior infection offered against reinfection. But after delta became dominant, this trend shifted, with prior infection offering slightly better protection. However, this also coincides with a time when many Americans were several months out from their shots, and before boosters were authorized.
Vaccine immunity does fade over time, the study found, and the further out an individual is from one's last vaccine shot, or a prior infection, the more likely it is that they will experience a breakthrough infection.Dennis Simmons receives his booster vaccine shot from nurse Mariel Miagusko during a COVID-19 vaccination event in Chatham, Ill. , Dec. 30, 2021.
Scientists also suggest the study reinforces the evidence that"vaccination remains the safest strategy for protecting against COVID-19."
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