Conducted by the University School of Medicine and VA in Saint Louis, the study investigated the impact that multiple COVID infections can have on the immune system. The study population had 257,427 participants who contracted COVID-19 only once and 38,926 participants who had experienced two or more SARS-CoV-2 reinfections.
In the test group with reinfection cases, 12.29% had two infections, 0.76% of them had been infected thrice, and 0.08% of those people had four or more infections. The median time distribution between the first-second infection was 79 days. Whereas, the median time distribution between the second-third infection was 65 days. The findings were startling.