Canada has not seen the predicted surge of COVID-19 cases in hospitals that many feared would overwhelm the health-care system and lead to a spike in deaths, but experts say relaxing physical distancing measures anytime soon could put that in jeopardy. There are almost 30,000 presumptive and confirmed cases in Canada, but Chief Public Health Officer Dr. Theresa Tam acknowledged “cautious optimism” Wednesday as the rate of new cases went from roughly doubling every three days to every 10 days. CBC