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New Zealand Nurses Organisation Dunedin organiser Lorraine Lobb said public hospitals should not be used as profit-making entities.
Mrs Lobb said there was not enough money in the health sector to provide a profit.
''There is no profit in health. That's why there's a deficit now.''
A privatised rebuild would be unpopular in the community as well as among doctors and nurses, she said.
The Otago Daily Times reported yesterday on a row between Infrastructure New Zealand and the Association of Salaried Medical Specialists.
INZ chief executive Stephen Selwood said senior doctors should keep out of the Dunedin Hospital rebuild public-private debate.
In a new statement yesterday, ASMS executive director Ian Powell accused the industry group of ''spinning the benefits'' of public private partnerships (PPP).
International evidence showed they were flawed and expensive.
He said a 2014 working group report on PPPs for the European Commission highlighted their shortcomings.
The report found the public sector could borrow more cheaply, and PPPs were more expensive in the long term, Mr Powell said.
Most of those who commented on the story on the Otago Daily Times Facebook page yesterday strongly supported Mr Powell's stance.
Many criticised Mr Selwood for suggesting doctors should stick to surgery.
Yesterday Mr Selwood said he preferred not to make a further comment.
''All I was seeking was an open-minded and non-ideological approach.
''I think if I commented back, to be honest, it would just put petrol on to the fire,'' Mr Selwood said.
Investors might be asked to build the proposed Dunedin hospital and lease it back to the Crown/DHB for a set term under an option to be investigated by the Ministry of Health.