Moderna makes twice as many antibodies as Pfizer, study says

Moderna Inc.’s Covid vaccine generated more than double the antibodies of a similar shot made by Pfizer Inc. and BioNTech SE in research that compared immune responses evoked by the two inoculations. 

The study is one of the first to compare levels of antibodies produced by the two vaccines, which are thought to be one of the important components of the immune response. It didn’t examine whether the antibody differences led to a difference in efficacy over time between the two shots, which both were more than 90% effective in final-stage clinical trials The research looked at antibody levels against the coronavirus spike protein in about 1600 workers at a major Belgium hospital system whose blood samples were analyzed 6 to 10 weeks after vaccination.