Elderly show equally strong antibody response to first dose of AstraZeneca, Pfizer COVID-19 shots

The first study to directly compare immune reactions between 's and 's COVID-19 vaccines has found similarly strong antibody responses in over 80-year-olds after a first dose of either shot, UK scientists said on Wednesday.

The study also found, however, that a critical component of the immune system known as T cells showed a more enhanced response in those who got the AstraZeneca vaccine than in those who got the Pfizer one - a finding scientists behind the study called worthy of more investigation.