Inside Ontario's overwhelmed labs: How lingering issues and mistakes caused massive COVID-19 testing backlog

Over the summer, as the rest of the country opened up and slowed down, and the specter of COVID-19 began to fade, life inside Ontario’s large medical laboratories continued to accelerate on a kind of perpetual motion pace, building speed and building size without ever slowing down, no matter what came in, who showed up or whether anyone could find any room for the new machines.In Mount Sinai Hospital, in Toronto, Dr. Tony Mazzulli, the hospital lab’s microbiologist in chief, was bus