Middlemore Hospital has begun testing every ward patient for Covid-19.
Mobile testing teams are going bed to bed offering tests, even to asymptomatic patients, and they will do the same for new patients.
The move was sparked by the investigation into unlinked casesin the outbreak - those with no known connection to current clusters - and to check whether the virus is circulating undetected in South Auckland.
The hospital's chief medical officer Pete Watson said it was part of surveillance testing happening in many parts of the city.
"Although it is an issue for us if we detect a case, we think it is important we detect all the cases, whether they are in the hospital or the community," he said.
A Covid test kit prepared for swabbing a patient. Photo / Tania Whyte, File
"We are trying to play our part to support the community surveillance for Covid."
Between 200 and 300 patients were in hospital at the moment, with up to 50 a day likely to be swabbed who otherwise would not have been, he said.
Last week, five Covid-19 people were treated at the hospital with no idea they had the virus until they were tested there.
One was so sick, he was admitted to intensive care the next day.
Another had abdominal pain, one of the less common but well known symptoms of the virus, and spent hours in a ward with other patients before he was tested.
Since then swabbing in the emergency department has increased and abdominal pain was added to the symptoms potential Covid patients are screened for.
The latest testing is for patients staying in all areas of the hospital, such as those who may be in for cancer treatment or surgery.
