Prime Minister Jacinda Ardern says the new community cases in Auckland had contact with another family during the level 3 lockdown earlier in February.

"We have now confirmed how our latest case M and N came to be infected with Covid-19. That is because they had contact with another family that we had identified as part of the Papatoetoe cluster during level 3."

Ardern says the contact between the families was not disclosed to contact tracers prior to them going into quarantine.

She says she can't say why that wasn't disclosed, but it now explains how the infection came about.

She is urging people to follow health advice and Covid-19 protocols and does not think this family wilfully ignored advice.