ATLANTA - Vaccinated people who had previously been infected with COVID-19 and contracted the virus during the delta variant surge last year were better protected against the disease than those who were vaccinated and did not become infected, the CDC reported on Jan.
19.The findings give new insight into natural immunity against current and potentially upcoming variants.Researchers also noted that protection specifically against the delta variant was highest among those who were both previously infected with the virus and vaccinated. RELATED: Doctors discuss natural immunity, post-COVID activities"During May–November 2021, case and hospitalization rates were highest among persons who were unvaccinated without a previous diagnosis.
Before Delta became the predominant variant in June, case rates were higher among persons who survived a previous infection than persons who were vaccinated alone.
By early October, persons who survived a previous infection had lower case rates than persons who were vaccinated alone," the CDC wrote.