Effectiveness of a fourth SARS-CoV-2 vaccine dose in previously infected individuals from Austria.

Alena ChalupkaLukas RichterAli ChakeriZiad El-KhatibVerena Theiler-SchwetzChristian TrummerRobert KrausePeter WilleitBernhard BenkaJohn P A Ioannidis Stefan Pilz

Published in: European journal of clinical investigation (2023)

In previously infected individuals, a fourth vaccination was not associated with COVID-19 death risk, but with transiently reduced risk of SARS-CoV-2 infections and reversal of this effect in longer follow-up. All-cause mortality data suggest healthy vaccinee bias.

Keyphrases

sars cov
respiratory syndrome coronavirus
randomized controlled trial
systematic review
electronic health record
coronavirus disease
machine learning
artificial intelligence
deep learning