Surviving Covid-19 disease protects up to 90 percent from a serious or fatal illness for at least ten months. The evaluation of 65 scientific studies from 19 countries on the subject of immunity against infection after SARS-CoV-2 infection included all virus variants that have appeared internationally (Wuhan, Alpha, Beta, Delta and Omicron BA.1) up to September 31, 2022.
However, the protective effect against serious and fatal diseases caused by the Covid-19 pathogen seems particularly important. After ten months, an initial infection with the Omicron virus variants (Wuhan, Alpha, Delta) protected 90.2 percent from a serious or even fatal further illness.
After 40 weeks, an Omicron BA.1 infection still had a protection rate of 88.9 percent against another infection with a severe to fatal course.
The safest way to achieve effective immunity against SARS-CoV-2 – especially to protect against severe disease progression – is still vaccination, emphasized the experts around Stephen Lim from the University of Washington.