Plus_Booster: Effectiveness, Immunogenicity and Safety of the Second Booster Dose of the Vaccine Against COVID-19 in the Elderly

Jcovden (COVID-19 vaccine (Ad26.COV2-S [recombinant])) - J&J

Comirnaty (tozinameran) - Pfizer, BioNTech

Vaxzevria (ChAdOx1-S recombinant) - University of Oxford, Emergent Biosolutions, Jenner Institute, Barinthus Bio, AstraZeneca

http://clinicaltrials.gov/ct2/show/NCT05283902

Mar 24, 2026