The patient is now isolated on a ward set up specifically to handle Covid-19 infections, and investigations are underway to determine the source of their infection.
Of the four new cases recorded on Thursday, three have been linked to the current outbreak but one remains unlinked - investigations are underway to determine the source of this person's infection,
Wellington has also recorded one high-risk location of interest – Denny's in Porirua.
Anyone who was at the diner between 9.15am and 10.50am on Monday is asked to self-isolate, test immediately and again on day five.
Only one case – in the Hutt – has been confirmed as Omicron, but New Zealanders have been asked to now assume all cases are the new infectious variant.