A study by the Centres for Disease Control and Prevention claims that unvaccinated people are more than twice as likely to be re-infected with COVID-19 as the fully vaccinated.
The agency said the finding supports its recommendation “that all eligible persons be offered Covid-19 vaccination, regardless of previous SARS-CoV-2 infection status.”
Some US politicians, including Senator Rand Paul, have in the past said they do not plan to take a COVID-19 vaccine because of their natural immunity derived from prior infection.
The new study was based on 246 Kentucky adults who were re-infected in May and June this year after previously being infected in 2020.
They were compared with 492 “controls” who were matched by sex, age, and time of initial positive test.
The analysis found that unvaccinated people were 2.34 times as likely to be re-infected compared to people fully vaccinated with the Pfizer, Moderna or Johnson & Johnson vaccines.
The paper said the duration of infection-acquired immunity remains poorly understood and may be affected by the emergency of newer variants.