Principals are fuming that schools won't have ready access to rapid antigen tests (RATs) to help keep their doors open during the Omicron outbreak.
They want teachers to be included in an exemption scheme that lets some critical workers bypass close contact isolation requirements if they return daily negative rapid antigen tests.
Schools have been told they generally won't be part of that scheme, although exceptions will be made if they don't have enough staff able to be on site, to look after children who cannot learn from home.
The scheme does include some staff in boarding school hostels.
Secondary Principals Association president Vaughan Couillault told Morning Report teachers should be recognised as critical workers and included in the scheme.
"I realise it's not necessarily an education decision, it's a health one, so we don't necessarily want to shoot the messenger, however ... it's not a good look when you're telling the providers of an essential public good, which education is, ... 'bad luck, you don't qualify for the rapid antigen testing scheme and just make do with whatever you can'."
Last year's extended lockdowns in Auckland, Waikato and Northland had proved how essential education providers were to the community, he said.
Keeping schools open was important, not only for students' education and well-being, but to ensure the economy could prosper, he added.
"There's the education and social side for students, and then when you think about education being a public good, it's a public good because not only does it serve the educational well-being needs of the students, economically - for the grown ups - it looks after your babies for you, so that you can head off to ... work, and that's got to be good for the economy."
The Principals' Federation president, Cherie Taylor-Patel, told RNZ she understood frontline workers and the health sector needed to be prioritised as critical workers, but hoped RATs would arrive in time to be useful to schools.
"We absolutely hope that the RAT testing kits will be available to schools before they absolutely need them - before schools are in crises."
Couillault also expressed concerns about the possible timing of the RATs' arrival, should schools be added to the exemption scheme.
"It appears that, with all the good intentions in the world, they may well be arriving in the middle of March ... a little bit late to the party because it's middle and end of February that it looks like we're going to need them."
Te Tai Tokerau Principals' Association president Pat Newman told Morning Report one Northland school had already had to move to distanced learning due to staffing issues and the lack of access to RATs for teachers would likely see more schools in the region shutting.
"As far as I'm concerned, we're being left out in the cold; in Te Tai Tokerau we do not have relievers available. Just the other day ... we had one teacher going between rooms because we couldn't get relievers," he said.
"I don't know what happens if it's long-term, we will have to shut up and send kids home, and then all the essential workers that are out there will have to stay home to look after their kids.
"It's just not logical, but we're used to a lot of that coming out of the Ministry of Health these days.
"It's another rash ruling from the Ministry of Health and we're used to having rather insane ones coming from them."
However, the Ministry of Health said decisions on who is included in the scheme are made by the Ministry of Business, Innovation and Employment (MBIE).
In a statement, MBIE said schools might be considered critical where they provided support for critical services by supervising the children of workers unable to have them at home.
"They may, therefore, choose to register now, and will need to assess whether they need to have a close contact come back to work in order to continue to deliver this service," it said.
"The scheme is not intended to enable the attendance of all staff and students - schools have planned for delivering hybrid learning in a range of scenarios when teachers or students are having to isolate at home. This scheme is only for those people who can't have their children at home."
MBIE said school staff would only be able to collect a RAT kit if they were a close contact and the school required them to continue working.
Registered organisations (including schools) were not provided with RATs in advance, nor were they able to access bulk supplies through the close contact exemption scheme.