More than 60 patients at Middlemore Hospital are being considered close contacts after two people with the virus turned up at the emergency department on Wednesday.
One of those patients self-discharged from hospital, but is now under the care of the Auckland Regional Public Health Service.
The Ministry of Health confirmed this last night, but says the public health risk is deemed to be low.
Thirty-four of the close contact patients remain in hospital and have been moved into isolation wards, while 32 who were discharged are being followed up and tested.
Middlemore Hospital's chief medical officer Peter Watson spoke to Corin Dann.
