COVID-19 vaccines: six months and 2 billion doses later
On December 8th 2020 at 6:30 AM, the first COVID-19 vaccine was administered to a 90-year-old British woman in the United Kingdom.
Researchers say that vaccines can protect against some new variants, but two doses are more effective
Researchers from Public Health England looked at the vaccine effectiveness of the Pfizer-BioNTech and Oxford AstraZeneca vaccines against the COVID-19 variants originating in the UK and India.