A new study released Wednesday by the US Centers for Disease Control and Prevention (CDC) revealed that, during the Delta variant wave in the country, people who were not vaccinated but who survived Covid-19 were better protected than than those who have been vaccinated and not previously infected.
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The results obtained by the CDC show that previous coronavirus infection and immunity obtained by vaccines work in concert and contribute to herd immunity — when the number of people resistant to the virus reaches a sufficiently high fraction of the population that the virus cannot find it. others susceptible to infection.
For the study, data on infection, hospitalization, testing and immunization from May to November 2021 were compiled in the US states of New York and California, which represent almost 20% of the country’s population.
The selected population sample, people over 18 years old, was divided into four groups:
No Protection – Not vaccinated and not yet infected;
With Vaccination Protection – Vaccinated in two doses and not yet infected;
With Natural Immunity – Unvaccinated and already infected;
With Dual Infection – Vaccinated and already infected.
Compared to the “Without Protection”, the “With Vaccine Protection” group had a 20 times lower risk of becoming infected with covid, demonstrating the protection provided by the vaccine. Among those “With Natural Immunity” the risk was seven to ten times lower and eight to ten times lower in the “Double Infection” group. A detail: these results refer to the beginning of May, before the Delta variant was dominant.
The scenario of the Delta variant of covid-19
With the advancement of the Delta variant in the US last year, the study captured another cut from the beginning of October: compared to the “Without Protection”, vaccine protection decreased the risk of covid by four to six times, immunity 15 to 30 times, and double protection 32 to 20 times.
Thus, against Delta, the combination of vaccine and previous infection became the best scenario in the case of contamination by the new coronavirus.
“Further studies are needed to establish the duration of protection from previous infections by variant type, severity, and symptomatology, including for the Ômicron variant,” the article concluded.
Credits: West Magazine.
