Elderly show equally strong antibody response to first dose of Astra, Pfizer Covid-19 shots
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

The first study to directly compare immune reactions between Pfizer's and AstraZeneca'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.