From September 2018:

For a second time, an arbitrator has ruled in favour of the Ontario Nurses’ Association, ordering a major hospital group in Toronto to rescind its “vaccinate or mask policy.”

In St. Michael’s Hospital and The Ontario Hospital Association and The Ontario Nurses’ Association, arbitrator William Kaplan struck down the policy in effect at St. Michael’s Hospital and several other hospitals that form the Toronto Academic Health Science Network, saying that the policy does not protect patients and doesn’t serve to prevent the transmission of the flu in hospitals.

// ONA wins second arbitration against hospitals on ‘vaccinate or mask’ policy