Hospitals around Hamilton, Burlington seeing earlier spike in ‘viral activity’ this flu season The SpecMask policy begins Monday at Sarnia and Petrolia hospitals because of flu numbers The Sarnia ObserverBluewater Health is the latest hospital to implement mandatory masking as flu cases surge CBCIncrease in cold, flu, and COVID cases brings return of masks to Ontario hospital INsaugaBluewater Health implements mandatory masking amid rise in flu cases CTV News