A vaccine study in the United Kingdom reports that getting a dose of the Pfizer-BioNTech vaccine four weeks after a dose of Oxford-AstraZeneca produced a much stronger immune response than two doses of AstraZeneca.
Canada is on the cusp of hitting its first national vaccination target, but chief public health officer Dr. Theresa Tam says the Delta variant of the virus that causes COVID-19 might mean the country has to up its vaccine game again.
A new study in England suggests even just one dose of the Pfizer-BioNTech and Oxford-AstraZeneca vaccines are extremely good at keeping people from ending up in the hospital if they contract COVID-19 from the Delta variant of the virus that causes it.
Prime Minister Justin Trudeau is spending the last day of his first international trip in more than a year visiting a plant that played a pivotal role in Canada's early rollout of the COVID-19 vaccine.
Prime Minister Justin Trudeau pledged 13 million surplus vaccines to help the world get immunized against COVID-19 as he and other G7 leaders wrapped up a weekend summit in Britain dominated by the pandemic, climate change and China.
Preliminary results of an ongoing study in the United Kingdom suggest alternating the Oxford-AstraZeneca and Pfizer-BioNTech vaccines causes more frequent mild to moderate symptoms, but there are no other safety concerns from mixing those vaccines.