New Zealand has 25 more cases of Covid-19 today.
Two of the cases are linked to the port worker who tested positive over the workers, 23 are imported cases at the border, including 18 infected foreign fishermen.
Director general of health Ashley Bloomfield is holding a press conference to provide a Covid-19 update.
One of the cases was previously considered a casual contact of the port worker and worked in the same small firm. Bloomfield said they had a small exposure - a few minutes in the same room - on Friday morning, and has one household contact also being tested.
The second workplace positive case came back positive this morning, Bloomfield said.
They were a previously reported workplace close contact of the port worker, and they have been in quarantine at the Jet Park since Sunday. They were previously tested and had returned a negative result as part of regular testing of port workers.
He had symptoms yesterday and was tested yesterday. His close contacts are in isolation and are being tested.
Further interviews are underway with both new community cases, Bloomfield said.
Infection on the vessel now in Brisbane remains the most likely source of infection, he said. No testing results from those on the ship are available yet.
There are 19 crew members on that ship.
Infected fishermen
There are now 18 cases in the Sudima Hotel in Christchurch among the Russian and Ukranian fishing crews.
Yesterday 11 fishermen tested positive out of 237 crew who arrived on a flight from Moscow and landed in Christchurch last week.
They were all tested pre-departure, and Bloomfield said two people didn't fly out because they tested positive.
They were tested via nasal swab, he added.
Some of the cases in the 18 people are new acute cases, and some are historical, he said, based on the CT values.
Those who have tested positive are now in a dedicated quarantine wing in the Sudima. Many are in twin rooms and Bloomfield said moving them into single rooms was being looked at.
"We are adding an additional day six testing for all those people, and that will happen tomorrow."
"This group may need to stay for additional days beyond the 14 days."
All staff at the Sudima have been tested, and their families will also have access to testing, as will the bus company that took them to the Sudima and airport staff in Christchurch.
Sealord chief executive Doug Paulin said earlier the workers would have spent a period in isolation in their home country before boarding the plane. They also had to test negative within three days of flying.
"We've got some fishers that weren't showing symptoms and tested negative, but have since tested positive," he told Newstalk ZB.
He had yet to be notified if any of the workers who had tested positive were Sealord's workers.
Paulin said it was "fantastic" that the Government had set up such stringent border control measures.
Last month the Government announced border exceptions for foreign workers, including 30 veterinarians, 570 deep-sea fishing crew, and 210 agricultural and horticultural mobile plant operators.
Shortages in deep-sea fishing workers could not be filled by Kiwis in the short-term, Immigration Minister Kris Faafoi said at the time.
"In exchange for the border exception, the fishing industry has committed to removing barriers to employing New Zealanders, including reviewing pay structures and business models, and investing significantly in training and education."
This morning a spokesman for Faafoi said there were no plans to change the border exception scheme.
Paulin said the fishing vessels had 100 per cent foreign crew and it had been that way for 25 years.
There were still 30 to 40 vacancies on the vessels with New Zealand crew "despite advertising up and down New Zealand".
He said young Kiwis were not inclined to do "more labour-intensive roles", and a life at sea was "not a life for everyone".
Unrelated community cases
Bloomfield said there were also three unrelated imported cases who flew in from London and who tested positive on routine day three testing.
A positive day 12 test raised the possibility of cross-infection while people were in quarantine, he added.
There were two imported cases in managed isolation in Auckland, who both tested positive on a day three test. They will both be transferred to the Jet Park quarantine facility.
Ship crews
Meanwhile, the port worker who tested positive for Covid-19 over the weekend worked on the Ken Rei and one other ship in the past fortnight.
Napier Port has decided today the ship Ken Rei, which has 21 crew members onboard, should remain offshore for a 14 day isolation period.
A letter of advice from the Ministry of Health claims the vessel can safely berth at any New Zealand port while following Covid 19 guidelines.
But Napier Port says the best precaution for its community is to keep the Ken Rei anchored offshore until Wednesday 28.
They say at that time, they will assess the circumstances of the vessel.
The worker also worked on the Sofrana Surville, in Auckland on October 12 and 13.
It's believed he caught the virus while working on that ship. It arrived in Brisbane on Monday night.
The Ministry said yesterday it was following up on the health of the 19 crew members onboard.
The Sofrana travelled from Brisbane to Tauranga and then to Auckland, where eight crew joined it from the Philippines. They had flown into New Zealand and were released from managed isolation on October 13.
Meanwhile, a New Zealand-based ship with a New Zealand-based crew was to be tested by Kiwi officials today.
But the vessel, the Moana Chief, was considered unlikely to be the source of infection.
It was moving from Marsden Point to Tauranga yesterday.
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