On January 7, the Montreal Gazette said:
The Pfizer and Moderna vaccines use a new technology, and it can't be taken for granted that what has worked in the past will also work now.
“My gut feeling is that up to six weeks, I won't have any problems,” said Quach-Thanh. “After that, can I say that up to 12 weeks there are still no problems? I'm not sure.”
Is the four-month recommendation a “gut feeling”?