Challenge trials face too many ethical and logistical hurdles to go forward, experts say
Four Liberal MPs and health experts recently penned an op-ed arguing that challenge trials are worth the risk.
Canada's Chief Public Health Officer Theresa Tam, pictured June 15, 2020, arriving at the West Block to hold a press conference to update Canadians on the response to the ongoing COVID-19 pandemic. Dr. Tam has said that vaccines won't be a silver bullet in fighting COVID-19. The Hill Times photograph by Andrew Meade