Third Dose mRNA Vaccination against SARS-CoV-2 Reduces Medical Complaints Seen in Primary Care: A Matched Cohort Study

Scientists conducted a daily longitudinal exact one-to-one matching study based on a set of covariates. They obtained a matched sample of 315,650 individuals aged 18–70 years who received the 3rd dose at 20–30 weeks after the 2nd dose and an equally large control group who did not.