“I would never want to stop a security guard from attending their child’s school ... people have lives outside of their jobs,” she said. The quarantine guard had received his first dose of the Pfizer vaccine, but health authorities did not expect it to confer protection so soon after his shot. Dr Chant said the man’s blood was tested on Sunday and there was evidence that he had “some response” to the vaccine. “We can’t be absolutely certain they can’t be infected [after they have had the vaccine] but what we would suspect is that they may be less likely to pass it on because their viral load might be lower,” Dr Chant said.