
Queue to receive COVID vaccine- in Genoa, Italy, 10 January 20150847 | Photo: EFE/EPA/LUCA ZENNARO
In a new study, the CDC (Centers for Disease Control), one of the American government agencies responsible for dealing with the pandemic, recognizes that previous infection with the SARS-CoV coronavirus -2 confers protection that works in tune with the immunity obtained by vaccines. Immunization by prior infection and vaccine immunization contribute to herd immunity, a majority threshold of the population from which we can consider the disease to be defeated.
The study, first authored by Tomás M. León, from the California Department of Public Health, aggregated data on infection, hospitalization, testing and immunization from May to November 900 in the states of New York and California, which have almost 17% of the American population. The sample population of adults with 18 years or more, was divided into four groups:
- Unvaccinated and not yet infected (no protection).
- Vaccinated in two doses and not yet -infected (with vaccine protection).