LONDON (Reuters) - The first study to directly compare immune reactions between Pfizer's and AstraZeneca's COVID-19 vaccines found strong and broadly similar antibody responses in over 80-year-olds after a first dose of either shot, scientists said on Wednesday.
The UK study also found that a critical component of the immune system known as T cells showed a more enhanced response in those who got the AstraZeneca/Oxford University vaccine than in those who got the Pfizer/BioNTech one.
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