If an MIQ worker refuses to be vaccinated and their employer can't find them other work, they should "not necessarily" lose their job, Unite Union says.
It comes after it was revealed that the latest MIQ workers to test positive for Covid-19 had not been vaccinated against the coronavirus yet.
Unite Union national secretary John Crocker told RNZ's Morning Report: "People can't be terminated for some of these reasons. There's a worst case scenario here we don't want to run into which is someone has a legitimate medical reason for not getting a vaccine [being terminated for that] would be a disaster.
"We're trying very, very hard to avoid terminations, because there are situations out there which are just a terrible look and unfair on each individual."
Crocker believed that employers would be "very keen" to not let people go.
"These people, they are the ones who have been working in MIQ for a year now, they're the ones who have been keeping us safe the whole time.
"They're the ones who have gone through redundancies, they've seen some of their colleagues leave, and if someone has got a real reason for not getting the vaccine they're not going to want to fire that person that we're calling heroes."
But it was appropriate for new border workers to be required to have the vaccination when starting a role, he said.
The union had not heard of any genuine resistance from its workers, Crocker said.
"Those who have been hesitant have wanted more information and as far as I know, we've been able to get it.
"I think it's time for the ministry to look at itself. I think we're all a bit surprised that this outbreak has happened through two security guards who weren't vaccinated and I think the government really needs to look at its processes rather than look at these workers."
He was "fine" with the timeframe for vaccinations for frontline workers.
"We always knew we had 10 weeks from late February to the beginning of May ... it's going to be difficult if those conversations come up (with employers about not being vaccinated) ... some people are going to have legitimate reasons for not getting the jab as well, so it's going to be a question of 'how can we find them other employment where they are not disadvantaged at all'."
The union often heard stories about discrimination faced by MIQ workers and some who weren't getting the living wage, Crocker said.
"They're feeling pretty fatigued by this whole process."
National Party deputy leader Shane Reti told RNZ's First Up if an MIQ worker refused a vaccine, redeployment to a low risk workplace should be considered.
"I think that should happen soon. I don't think there's any delay that should come with that. I think that is a clear decision, I respect that decision, but lets keep them safe, lets keep everyone safe and move them to a lower-risk role."
He supported giving people the choice to have the vaccine or not.
But he was unimpressed that some frontline workers had not yet been vaccinated.
"We've had a long time to figure out a vaccine programme, we've had the vaccines available and we've identified as a high priority this group. How hard can this be?... It sort of eludes me."
Yesterday Director-General of Health Dr Ashley Bloomfield said frontline workers have until the end of April to be vaccinated.
He said they were working to get those workers vaccinated or moved out of the front line.