COVID infections are at their lowest point in more than a year, but the virus may be evolving to a seasonal pattern similar to influenza, and protection from previous inoculations may be starting to wane.
Question: I read in the news that health officials are urging Canadians to get another COVID vaccine booster this fall. COVID seems to have virtually disappeared. So, why do we need another shot?
During the first three years of the pandemic, new and more contagious variants emerged. Waves of COVID swept through communities regardless of the time of year. “The southern hemisphere serves as a crystal ball to what we can reasonably expect in our future,” said Dawn Bowdish, a professor of medicine and a Canada Research Chair in Aging and Immunity at McMaster University in Hamilton.
Although vaccines have been highly effective in reducing the number of hospital stays and deaths, this tends to wane after about six months, said Dr. Razak. Dr. Bowish agrees with the recommendation to stop targeting the original strain because “it’s now extinct.” Essentially, it has been outcompeted and replaced by subsequent variants ranging from Alpha to Omicron.
For the vaccine campaign to succeed, public health officials “will have to make it as easy as possible to get a shot,” said Dr. Rasmussen. “For example, they could allow people to receive their booster at the same time as their seasonal flu vaccine.”
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