COVID-19: ‘Not confident’ in duration of immunity from exposure to Omicron, Moore says

Ontario’s chief medical officer of health Dr. Kieran Moore said Thursday that health officials are “not confident” in the duration of immunity gained from an exposure to the Omicron variant. He said immunologists say a booster vaccine “significantly” adds to protection against the virus.

• It may be possible for people who got Omicron to be reinfected with it, Ontario experts say