The study, published as part of the [CDC’s] Morbidity and Mortality Weekly Report (MMWR), examined hundreds of residents, finding that the unvaccinated individuals had 2.34 times greater odds of reinfection compared with fully vaccinated individuals. The residents were aged 18 or older and had previous COVID-19 infections in 2020 and experienced a second infection between May and June 2021 – the time period that aligns with the emergence and spread of the delta variant.