"We need to get our shots as quickly as possible", says Trudeau.
Health officials and the Canadian Pharmacists Association have expressed the contradicting advice will only lead to more vaccine hesitancy.
Emberley says he got the AstraZeneca vaccine himself three weeks ago and has no regrets.
Niagara Health's Infectious Diseases and Antimicrobial Stewardship and Pandemic Preparedness Lead Dr. Karim Ali says the NACI notion that Pfizer and Moderna vaccines are preferable 'flies in the face of what we have been trying to do and achieve'.More news: Philippines foreign minister issues expletive-laced tweet over China sea dispute
"Based on everything I know right now I would not make a different decision", he said.
He said he's also anxious that this will make Canadians who already got AstraZeneca afraid to get their second dose. While Canada was receiving just over a million doses each week in April, the supply will be doubling, with Canada receiving more than two million doses a week until the beginning of July, which will give the government a boost in reaching its goal of having all adults vaccinated by the end of September. "Take the first one you're offered".
Meanwhile, there continues to be backlash against the most recent comments from the National Advisory Committee on Immunization (NACI).as a second person in Canada has died after receiving the AstraZeneca COVID-19 vaccine. But the syndrome is so new, there is still little known about what the real risk is, why it is happening and who might be most likely to develop clots.
It is the second reported death from vaccine-induced immune thrombotic thrombocytopenia or VITT linked to the AstraZeneca vaccine in Canada.More news: At least 15 killed after train bridge collapses in Mexico
Canada's inoculation drive was slow to get started and has struggled with repeated delivery delays, but appears to be back on track with millions of doses expected over the coming months.
Shipments of the Moderna vaccine arrived a day after Health Canada's approval, and it was first distributed to Canada's North.
Trudeau and his wife last month received a first dose of the AstraZeneca vaccine, seeking to reassure Canadians it is safe. Health Canada discovered the drug substance in them was made at a Maryland manufacturing plant cited by the United States for numerous safety and quality control violations.More news: Province to legislate three paid sick days