A medical expert says Auckland's lockdown isn't working - and extending it won't either.

Auckland University Emeritus Professor Des Gorman claims ongoing problems aren't being addressed and extra measures are required.

Gorman says there are a few reasons for new cases. One, he says is that essential workers are getting infected. He says a solution to this is daily saliva testing.

A second way in which we could be getting new cases is through chains of transmission in the community we're not aware. Gorman says we should set up mass surveillance saliva testing at supermarkets and pharmacies where the epicentres are, to flush out these chains of transmission.

The third explanation he says is people simply not complying with level 4 rules. To remedy this he believes we need community lead surveillance.

He says shutting down this outbreak is going to require something different.

LISTEN ABOVE