An infectious diseases specialist says new, wider Covid-19 testing rules still won't test enough people to give a true picture of community transmission.
The Ministry of Health says people can now be tested simply for having Covid-19 symptoms rather than - in most cases - needing to have had contact with a case or been overseas.
But epidemiologist Ayesha Verrall says the ministry is still relying on cases to turn up.
Instead it should be out looking for them.
She says everyone who turns up to their GP or calls Healthline with cold or flu symptoms should be tested but that still won't find everyone.
She says the people who don't go to their doctor need to be found and there are a lot of different ways to do that.
