COVID-19 vaccines: The new technology that made them possible

COVID-19 vaccines: The new technology that made them possible

Days before her 91st birthday, Margaret Keenan became the first person in the world to receive the Pfizer-BioNTech COVID-19 vaccine outside of clinical trials. 

Keenan, who was sporting a polka-dot cardigan over a festive shirt, was given the first dose of a two-dose vaccine at the University Hospital Coventry in England, setting off the first mass vaccination effort against a virus that has now infected at least 70 million people worldwide and killed 1.5 million. An 81-year-old named William Shakespeare was next in line for the vaccine. 

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