The Westgate Medical Centre where the woman with the second confirmed case of coronavirus sought medical assistance.

A worker has criticised an Auckland medical centre for apparently notifying staff three days after it was visited by a patient with coronavirus.

The health professional, who spoke to Stuff on the condition of anonymity, said a staff briefing at Westgate Medical Centre on Thursday was "too little, too late".

They said the patient wasn't wearing a mask when she entered the West Auckland clinic on Monday. The clinic said all health protocols were followed.

The patient was given a swab test and later tested positive for the virus. She later spoke to Stuff and revealed that her husband was the fourth confirmed case.

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The worker, who originally contacted Stuff on Wednesday with their concerns, alleged the Westgate Medical Centre didn't notify anyone else at the clinic about their possible exposure until Thursday, after the story had gone live on Stuff.

They said the clinic wouldn't have known the woman's test results until probably late Tuesday. But the staff and members of the public who were potentially affected should have been contacted.

"My guess is they didn't want anyone to know because they didn't want to deter anyone coming to the clinic."

The health professional said when staff were informed, they were told not to talk to the media.

"They gave us the name of a person and if we were contacted by the media we should refer them to that person."

The staff member said the clinic is now trying to contact the members of the public who were visiting the centre at the time. But they said they are still disappointed in the management of the Westgate Medical Centre which they felt was putting its own financial interests ahead of those of the staff and public.

Tamaki Health, which runs the Westgate Medical Centre, said the staff were notified on Thursday by email after the Ministry of Health went public with an official announcement confirming the second coronavirus case on Wednesday.

"As we have said, all steps taken were in accordance with public health protocols," CEO Steffan Crausaz said. "Contacts are being traced and the attending GP is self-isolating."

Crausaz confirmed on Thursday that the woman had visited the Westgate Medical Centre on Monday as a walk-in patient and only one member of staff had been in close contact with her.

"Once the patient identified herself as having returned from overseas and was showing Covid-19 symptoms, all clinic staff followed Auckland Regional Public Health Service (ARPHS) protocols.

"No other staff were in close contact with the patient so they remain at work," he said. "The affected woman did not need to be hospitalised and is self-isolating at home.

"We continue to assist ARPHS in its efforts to trace and contact any people in the waiting room 15 minutes before the patient arrived to one hour after. We want to assure our patients that the clinic is safe to attend."