The world was watching as the United Kingdom became the first to roll out vaccinations against COVID-19 on Tuesday, December 9. The first people to receive the vaccine, 90-year-old Margaret Keenan and 81-year-old William Shakespeare.
The shot was developed by U.S. pharmaceutical company Pfizer and Germany's BioNTech.
The vaccine is given in two doses and could cause side effects, according to a preliminary report in the New England Journal of Medicine, though "no serious adverse events were noted."
On Wednesday, Britain's medical regulator advised that people with a history of serious allergic reactions should not get a COVID-19 vaccine. Two members of England's National Health Service staff who got the vaccine experienced reactions. They were both treated and recovered.
