The nurse's union is demanding an urgent review of the isolation management system after two health workers have caught Covid 19 in Christchurch.
Officials are convinced the managed isolation workers picked it up from Russian and Ukrainian mariners who've tested positive while staying at the Sudima Airport Hotel.
Kaiwhakahaere for the New Zealand Nurses Organisation Kerri Nuku said a review is in order.
"This is a system failure so we need to see and identify where in our system has it failed and what are the potential ramifications of that, where else might the system be leaking?"