The largest risk factor for another wave of infection is connected to the fact that most Canadians are susceptible to COVID-19 simply because they haven't had it. Canada's Chief Public Health Officer Dr. Theresa Tam said almost 2.5 million Canadians have been tested for COVID-19, with an average of about four per cent testing positive and more than 100,000 confirmed cases. "We have very small penetration of this disease in our society," said Raywat Deonandan, a global health epidemiologist and an associate professor at the University of Ottawa. "That means the vast majority are still susceptible, and if they are susceptible, then it doesn't take a whole lot for something to trigger another explosive growth." For that reason, Deonandan said there is a mathematical probability that another wave of infection is possible, but it may be less severe based on what we've learned about how to control the virus in the past six months. "We know that it loves mass indoor gatherings. That seems to be where the super spreading events tend to be: churches, karaoke bars, parties, nightclubs," he said. "So given that, that's kind of our way of controlling the second wave — if we just really monitor large indoor activities or prevent them entirely."
Adam Miller, 'Could Canada avoid a second wave of COVID-19?', CBC