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There were 50 new confirmed or probable cases in the last 24 hours, bringing the total to 205.
Community transmission is attached to cases in Marist College and from the World Hereford Cattle conference in Queenstown, while there are four other cases of community transmission.
The temporary changes to the Education Act mean Holsted is now in charge of all education facilities including 2,500 school board entities and 4,000 education service providers.
Holsted can direct how they operate and direct them to provide education in specific ways, for example online learning.
Hipkins said any direction shouldn't impinge on the academic freedoms of academic institutions.
For example, institutions would still be able to determine the nature and content of the educational programmes they provided, he said.
"We may need to act quickly with speed and pace from the centre and in order to do this these powers will be required.
"Education entities in New Zealand have a large degree of autonomy and in normal times this works well," said Hipkins.
"In an emergency such as this we need to move to a different way of working to allow central direction, co-ordination and cohesion and to move quickly to deal with issues as they emerge.
"This decision was not taken lightly. We'll be looking for things to go back to normal as soon as possible," Hipkins said.
Hipkins thanked all educational institutions for their "incredible response".