In a new study from the Centers for Disease Control and Prevention, researchers found unvaccinated people are more than twice as likely to be reinfected with COVID-19 as the fully vaccinated people.
The finding suggests all eligible people should be offered COVID-19 vaccination, regardless of previous SARS-CoV-2 infection status.
In the study, the team tested 246 Kentucky adults who were reinfected in May and June this year after previously being infected in 2020.
They were compared with 492 people who were matched by sex, age, and time of initial positive test.
The researchers found that unvaccinated people were 2.34 times as likely to be reinfected compared to people fully vaccinated with the Pfizer, Moderna or Johnson & Johnson vaccines.
They say the duration of infection-acquired immunity remains poorly understood and may be affected by the emergency of newer variants.
Some previous studies have found that blood samples from people previously infected with the original Wuhan strain had poor antibody responses to the Beta variant first identified in South Africa.
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