There are 15 new community cases of Covid-19, all located in Auckland, the Health Ministry says.

The number brings the total cases in the current Delta variant outbreak to 1123, of which 861 have recovered.

Most of today's community cases are household contacts of current cases, but three are still not linked to other cases.

Yesterday the ministry announced 23 new cases, all of which have now been linked.

The update yesterday coincided with Auckland's first day at alert level 3 after five weeks in full lockdown.