While overall COVID-19 vaccination rates continue to climb across Canada, some people remain hesitant about getting the shot. Similarly, viral vector vaccines (Johnson & Johnson and AstraZeneca-Oxford) have been made since the 1970s. WATCH | Why the COVID-19 vaccines came out so quickly:Speed of development of COVID-19 vaccines CBC News Manitoba 1:35 Epidemiologist Cynthia Carr says the COVID-19 vaccines are safe and no corners were cut during their development. According to published results, in their third trials, Pfizer and BioNTech tested 43,448 people, Moderna tested more than 30,000, AstraZeneca had 32,449 participants and Johnson & Johnson tested with 43,783 participants. Concerns about blood clotsIt's likely you've heard of very rare blood clots occurring in people who have received the AstraZeneca-Oxford and Johnson & Johnson vaccines.

Source: CBC News June 13, 2021 10:52 UTC