Director-General of Health Dr Ashley Bloomfield provides the latest figures on Monday, April 13, 2020.

Prime Minister Jacinda Ardern urged New Zealanders to stick to efforts that were showing signs of success, warning there would be no early easing of lockdown rules.

Lockdown will continue until the end of week four at least, with a final decision on whether or not to exit level 4 not due until April 20.

Ardern said no decision would be made before then.

"We need to use the most up to date live data that we have," she said.

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She also poured cold water on other suggestions of things returning quickly back to normal.

Border restrictions would be in place for some time, and discussions haven't begun on lifting them.

"I think New Zealanders should expect for us for a long time to come to have border restrictions and controls," she said.

Ardern offered some sympathy with those struggling with the lockdown.

"Week three may in fact feel the hardest," Ardern said. "We're coming around the bend, but we can't quite see the finish line."

But she urged New Zealanders to "please stay home, please stay in your bubble".

She said that Sport Minister Grant Robertson had recently told her "you can't squander a strong half time lead by letting up or getting overly confident"

BRADEN FASTIER/STUFF New Zealand is not in a position to move out of Covid-19 alert level 4 early, despite low infection numbers, the PM says. But we can expect to learn more about what level 3 will look like this week.

The Government's efforts seem to be working, with just 19 new confirmed and probable cases confirmed since Sunday.

This is a dramatic fall from the high of 89 cases confirmed last Sunday. The total number of cases is now 1349.

The number of people who have recovered from Covid-19 continues to grow faster than the number of new cases with 75 people having recovered, bringing the total to 546.

But director-general of health Ashley Bloomfield also announced that another Covid-19 patient had passed away.

KEVIN STENT/STUFF Prime Minister Jacinda Adern said on Monday level 3 would still have significant restrictions.

The man was in his 80s and had been a resident at the Rosewood residential care home in Christchurch.

His death brings the toll for Covid-19 deaths to 5.

"We need to be prepared for further serious illness and possible deaths," Bloomfield said.

He also confirmed two more clusters - one at an aged care facility in Auckland and another small outbreak in Auckland.

Liu Chen/RNZ International arrivals at Auckland Airport in March 2020.

There were fewer tests conducted over the Easter weekend, with just 1660 tests being processed on Sunday.

Bloomfield said he'd been expecting a drop off in testing over Easter.

"This is a pattern we see in terms of people seeking health care on public holidays, in usual circumstances, and therefore we've seen that happen over Easter," he said.

He said that the level 4 lockdown meant it was likely that a whole range of respiratory illnesses like the flu and the common cold weren't having the opportunity to be transmitted between people.

That means that even fewere people will be getting the symptoms that might lead them to get tested for Covid-19.