COVID-19 reinfection rate less than 1 percent for those with severe illness, study finds

A review of more than 9,000 US patients with severe COVID-19 infection showed less than 1 percent contracted the illness again, with an average reinfection time of 3.5 months after an initial positive test.

source https://www.sciencedaily.com/releases/2021/06/210615132103.htm