British Columbia's decision to extend to four months the interval between first and second doses of three different vaccines amounts to a "population level experiment," said Mona Nemer, Canada's chief science adviser.
"I think that it's possible to do it. But it amounts right now to a basically population level experiment. And I think it needs to be done as we expect clinical trials to be carried out," Nemer told CBC News Network.
Nemer told host Vassy Kapelos that the data provided so far by Moderna and Pfizer on their vaccines were gathered when the first and second doses of the vaccines were being spaced three to four weeks apart, not three to four months apart.
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