They confirm that the unvaccinated are twice as likely to be re-infected

The study was based on a sample of 246 Kentucky adults who were re-infected with the virus between May and June of this year, after being infected for the first time in 2020.

They were compared to 492 people from a “control” group, depending on their sex, age and the date the contagion was detected.

According to the study, unvaccinated people were 2.34 times more likely to be re-infected than those fully immunized with Pfizer, Moderna, or Johnson & Johnson.

The exact duration of acquired immunity after infection is not yet clear and this could be altered by the emergence of new variants, the researchers say.

For example, laboratory studies have shown that blood samples taken from people infected with the original strain of Wuhan virus exhibited a weak immune response against the beta variant, first identified in South Africa.

One of the limitations of this study is that it was carried out before the appearance of the delta variant, which is today the dominant strain in the United States.

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