AstraZeneca blood clot risk remains low: Tam

Dr. Theresa Tam, Canada's chief public health officer, has explained why the National Advisory Committee on Immunization abruptly cancelled an expected announcement on Tuesday about its updated recommendations for the Oxford-AstraZeneca vaccine. Tam says the committee received some new data about the impact of COVID-19 variants of concern, and not because of any new information about the risk of blood clots that may be linked to the vaccine.