Joseph Johnson/Stuff
Work is underway to see if additional filtration systems need to be installed on air-conditioning units at MIQ facilities. (File photo)
Those two cases, along with two health workers in Christchurch and potentially the latest Northland case, could mean there has been five instances of shared airspace transmission.
Wilson said they might have been prevented if ventilation systems were better.
The ideal situation for good airflow in MIQ was pushing air out quickly while continually filling rooms with fresh air, he said.
Wilson said there needed to be more documentation on how many hotel rooms had windows that could be opened for natural airflow. He added that abandoning shared spaces and keeping people in their rooms could be one way to help.