The effectiveness of previous infection alone against symptomatic BA.2 infection was 46.1% (95% CI, 39.5 to 51.9). The effectiveness of vaccination with two doses of BNT162b2 and no previous infection was negligible (−1.1%; 95% CI, −7.1 to 4.6). Source: New England Journal of Medicine User TheHiveminder, in the WalkAway subreddit, 28 Nov 2022
Natural Immunity Offered More Protection Against Omicron Than 3 Vaccine Doses, New England Journal of Medicine Study Finds User BobBobBobsyouruncle, in the conspiracy subreddit, 21 Jul 2022
Effects of Previous Infection and Vaccination on Symptomatic Omicron Infections | NEJM User bearcatjoe, in the LockdownSkepticism subreddit, 19 Jul 2022
Effects of Previous Infection and Vaccination on Symptomatic Omicron Infections | NEJM User cakeforPM, in the CoronavirusDownunder subreddit, 09 Jul 2022