Compared to other strains of the virus
Two doses of the Oxford-AstraZeneca vaccine produces lower antibody levels against the Delta variant than other strains.
Researchers found those double-dosed with this vaccination have antibodies that are 2 and a half times lower against ithe variant, than the Pfizer vaccine.
The study found those who previously reported having Covid-19 symptoms had higher antibody levels after their first vaccination, than those who were asymptomatic.
