The authors of the study found that those who had a prior infection but no vaccination had a 46.1 and 50 percent immunity against the two subvariants of the Omicron variant, even at an interval of more than 300 days since the previous infection.
However, individuals who received two doses of the Pfizer and Moderna vaccine but had no previous infection, were found with negative immunity against both BA.1 and BA.2 Omicron subvariants, indicating an increased risk of contracting COVID-19 than an average person without prior infection and vaccination.
Six months after getting two doses of the Pfizer vaccine, immunity against any Omicron infection gradually dropped to -3.4 percent, below an average person without infection and vaccination (control) which would be set at 0.
For two doses of the Moderna vaccine, immunity against any Omicron infection dropped to -10.3 percent after more than six months since the last injection.
Excerpt:
The authors of the study found that those who had a prior infection but no vaccination had a 46.1 and 50 percent immunity against the two subvariants of the Omicron variant, even at an interval of more than 300 days since the previous infection.
However, individuals who received two doses of the Pfizer and Moderna vaccine but had no previous infection, were found with negative immunity against both BA.1 and BA.2 Omicron subvariants, indicating an increased risk of contracting COVID-19 than an average person without prior infection and vaccination.
Six months after getting two doses of the Pfizer vaccine, immunity against any Omicron infection gradually dropped to -3.4 percent, below an average person without infection and vaccination (control) which would be set at 0.
For two doses of the Moderna vaccine, immunity against any Omicron infection dropped to -10.3 percent after more than six months since the last injection.