* NZ cases rise to 20 - two high schools warned after parent's positive test
* First suspected case in Samoa - a Kiwi traveller
* Nobody saw or cared - mother's concerns about lack of checks at Auckland Airport
* $100m impact on Auckland city - what it means for ratepayers
* How to cope with the anxiety and fear caused by coronavirus
* Latest developments and essential information
The Government is today poised to unveil a significant relief package for the beleaguered aviation industry after the number of coronavirus cases confirmed in New Zealand jumped.
It comes as London faces a lockdown and all UK schools have been ordered to close in coming days while US President Donald Trump and Canadian Prime Minister Justin Trudeau closed their 8850km US-Canada border to "all nonessential travel".
The world's longest undefended border was being closed with the "mutual consent" of Canada, Trump said, and would not impact trade.
Trudeau agreed the decision was mutual. He vowed to "ensure the smooth flow of goods and essential materials and medication". He described new spending to ease the impacts of the coronavirus outbreak on Canadians.
Listen live: Click here to listen to Mike Hosking as he speaks to Director General of Health Ashley Bloomfield, Winston Peters and Rob Fyfe on coronavirus.
In the UK, London is braced for lockdown as the Government prepares emergency legislation to prevent the spread of coronavirus, the Telegraph reported. Sources close to the mayor's office say they expect a shutdown of the capital in the coming days.
Legislation in the Coronavirus Bill would give the Government emergency powers to "close premises" and "restrict or prohibit events and gatherings", including restricting transport networks.
The number of positive tests for coronavirus in the UK hit 2,626 while the death toll jumped overnight by 33 to a total of 104.
UK Education Secretary Gavin Williamson announced all schools will close at 1pm Friday (UK time) in an effort to slow the spread of the virus.
Select staff will work on, allowing the children of key workers to be cared for so their parents can continue to work.
In Italy, deaths will surpass China's total in just one more day. On Wednesday, Italy saw a record new high in the numbers of infections and deaths reported, adding more than 4200 new cases for a total of 35,713 infections. Another 475 people died, bringing Italy's death toll to 2978.
In New Zealand, the response to the virus is escalating with jury trials suspended for two months and the Government expected to announce further limits on mass gatherings.
Parliament, too, will today discuss proposals to allow greater use of video in procedures.
However, Prime Minister Jacinda Ardern is continuing to urge concerned Kiwis not to panic, saying they should instead prepare for what lies ahead.
• Coronavirus: What we know about NZ's 12 Covid-19 cases
• Coronavirus: Series of managed peaks NZ's best bet for Covid-19 spread
• Coronavirus: 'Imminent' roll-out of routine testing to see how widespread Covid-19 really is
• Coronavirus in NZ: Eight new cases, Jacinda Ardern says don't panic, but be prepared
Eight new cases were confirmed in New Zealand yesterday, the largest increase in any day, taking the total to 20.
The new cases are spread across the country - four in Auckland, two in the Waikato, one in Canterbury, one Dunedin and one in Invercargill.
"This is not a time for panic," Ardern said soon after the new cases were revealed. "It is a time for preparation."
Ardern urged anyone who had arrived back in the country in the past fortnight to go into self-isolation, even if they arrived before the requirement for self-isolation.
Director General of Health, Dr Ashley Bloomfield, told Newstalk ZB that there's been a big increase in testing over the past two to three days.
Bloomfield said 500 or 600 tests are now being done each day.
He said the positive tests have only been from those who've returned from overseas.
The increase in cases parallels a ramping up of testing from about 600 in the past six weeks.
And testing of seemingly well people who have had close contact with confirmed Covid-19 patients has begun for the first time.
Until yesterday, testing was almost entirely confined to people with symptoms of the disease. Close contacts without symptoms were asked to go into self-isolation.
The decision to test about 150 students at Logan Park High School in Dunedin where a new case was confirmed on Tuesday marks a relaxation of testing criteria from the weekend.
It is the first school identified as having a case and will be closed until Monday while the testing is done and it has been thoroughly cleaned.
The school student is the son of another Covid-19 confirmed case who had been in Germany.
Meanwhile, a teacher at Whangaparaoa College has gone into self-isolation because the teacher is the partner of one of the newly confirmed cases.
Principal James Thomas acknowledged in an email to parents that there would be high levels of anxiety.
"Please explain to your children that the staff member does not currently have Covid-19 and that they have not exposed anyone else to this virus."
All cases had returned recently from overseas: Three from Europe, and others from San Francisco, Canada, Gold Coast, Sydney, and London.
Bloomfield also defended testing at New Zealand's borders. He said even before people get to Customs, they have to fill out a health declaration.
He said the person has to be spoken to, and the form has to be ticked or stamped before they get through Customs and Immigration.
Bloomfield said a couple of days ago, 38 people were identified and assessed by a nurse at the airport so the process is picking people up.
Economic Development Minister Phil Twyford will unveil details of the Government's aviation relief package at an event at Queenstown Airport today.
Police announced yesterday that they had conducted spot checks on 50 tourists to confirm they were in self-isolation for a fortnight, a requirement introduced for all travellers to New Zealand since early Monday.
They said they had made contact with 41 individuals and would be following up on three others.
Chief Justice Helen Winkelmann said last night that jury trials would be suspended for two months because maintaining correct hygiene requirements in the court system was unrealistic.
"There is a special onus on the courts to protect the health of jurors who are performing an important civic duty," she said.
The trial of the alleged Christchurch mosque gunman is due to begin in early June.
Deputy Prime Minister and Foreign Minister Winston Peters pleaded for the 80,000 Kiwis currently on visits overseas to return now while they could.
"If you are travelling, it's very likely you could be shut off very shortly, " he said. "If you can get home, come home now."
Health Minister David Clark launched a campaign for this year's vaccine against the common flu, saying it could avoid taking up hospital resources that could be used to treat Covid-19.
About 1.77 million vaccines had been obtained – 400,000 more than last year – and priority would be given to the elderly, the most vulnerable and health professionals.
The political temperature flared in Parliament yesterday after National Party leader Simon Bridges pressed Ardern over the previously restrictive testing regime, and suggested testing had been rationed.
He said he had been contacted by half a dozen doctors who had expressed frustration about the testing criteria.
Ardern accused Bridges of being "borderline irresponsible" but he said it was his constitutional duty to get answers on the most significant issue New Zealand had faced in many years.