Genome sequencing has confirmed the Auckland Airport worker who tested positive for Covid-19 has the Omicron variant, the Ministry of Health says.

A household contact of the MIQ worker who tested positive on Tuesday also has the Omicron variant of Covid-19, the ministry reported.

The Ministry has published a new location of interest with one of the cases having visited a cafe in Half Moon Bay on Wednesday.

It said anyone seated inside the Ara-Tai Cafe at Half Moon Bay on 18 January from 12.30pm to 2.00pm was considered a close contact and must self-isolate and test immediately and on day 5 after exposure at the location of interest.

Customers seated outside during the same time are considered casual contacts and should self-monitor for 19 symptoms for 10 days, and if symptoms develop, get tested and stay at home until they receive a negative test result.

Yesterday three central Auckland nightclubs were listed as Covid-19 'close contact' locations of interest.

They are:

• Family Bar and Club Auckland CBD (270 Karangahape Road) Saturday 15 January 9.30pm to Sunday 16 January 12am
• Longroom Nightclub Grey Lynn (114 Ponsonby Road) Saturday 15 January 7pm to 9pm
• AV Club Auckland CBD (38 Customs Street East) Friday 14 January 6pm to Saturday 15 January 5am

Longroom Bar and Nightclub in Grey Lynn was named as a location of interest on 19 January. Photo: Google Maps.

The case of the MIQ worker's household contact was reported after 75 isolating close contacts already tested negative - and it comes with people surging to vaccination sites to make the most of paediatric and booster doses.

The MIQ worker's positive result had come as part of routine testing and was reported by the ministry on 15 January.

Two other household contacts are symptomatic but returned negative tests on Tuesday.

-RNZ.