There are no new coronavirus cases in the community and four in managed isolation, the Ministry of Health has revealed.

One of the four cases announced today is historic.

Today's Covid-19 update also takes into account Saturday, as the ministry's last update was Friday.

Two of the new cases in MIQ arrived in New Zealand from Kenya on April 10.

The other arrived on April 15; they were from Lebanon and their infection was detected upon arrival.

The other case was from Pakistan - they arrived on April 5.

The historic case arrived from Papua New Guinea via Singapore on 14 April and was tested on arrival. They are not infectious, according to the ministry.

The total number of active cases in New Zealand today is 102.

Today's update is the last one before the Australian travel bubble opens at 11.59pm tonight.

The Ministry of Health said this was a "timely reminder that people who visit New Zealand as part of quarantine-free travel will be able to download the NZ COVID Tracer app - there are no restrictions".

"People may need to search their App Store or Google Play for 'NZ COVID' not just COVID as the search will prioritise the app from their country, therefore adding 'NZ' will be important to discovering the app," a ministry spokesman said this afternoon.

Alternatively, he said, people can visit the ministry website and the link on the tracer app page will take them directly to the correct app in app stores.

"We recommend people continue to scan NZ COVID Tracer app. The more we all scan, the safer we'll all be. The data is stored on your phone until you choose to share it."

There are 2,2785,282 registered users of the Covid-19 tracer app.

"It's incredibly important that people keep a record of where they've been. It can help support contact tracers in tracing potential close and casual contacts of people who have tested positive for Covid-19."

Meanwhile, the total number of tests processed by laboratories to date is 1,972,640.

On Friday, 4688 tests were processed. On Saturday, 3965 tests were processed. The seven-day rolling average up to yesterday is 4,356 tests processed.

It has been almost two months since the last community case was detected in New Zealand