Vaccine effectiveness against SARS-CoV-2 reinfection during periods of Alpha, Delta, or Omicron dominance: A Danish nationwide study.
Katrine Finderup NielsenIda Rask Moustsen-HelmsAstrid Blicher ScheldeMie Agermose GramHanne-Dorthe EmborgJens NielsenChristian Holm HansenMichael Asger AndersenMarianna MeaidiJan WohlfahrtPalle Valentiner-BranthPublished in: PLoS medicine (2022)
This study shows that in previously infected individuals, completing a primary vaccination series was associated with a significant protection against SARS-CoV-2 reinfection compared with no vaccination. Even though vaccination seems to protect to a lesser degree against reinfection with the Omicron variant, these findings are of public health relevance as they show that previously infected individuals still benefit from COVID-19 vaccination in all three variant periods.