COVID-19 vaccine leads to higher overall antibody levels than a shorter gap, a British study found on Friday, but there is a sharp drop in antibody levels after the first dose.The study might help inform vaccination strategies against the Delta variant, which reduces the effectiveness of a first dose of COVID-19 vaccine even though two doses are still protective.
Canadian study finds mRNA vaccines produce more COVID-19 antibodies than AstraZeneca “For the longer dosing interval … neutralizing antibody levels against the Delta variant were poorly induced after a single dose, and not maintained during the interval before the second dose,” the authors of the study, which is being led by the University of Oxford, said.“Following two vaccine.