Newshub has learned details of one of the first cases of COVID-19 'community spread'.

The exact source isn't known, but the man became sick after playing a cricket match on the Kapiti Coast.

The man, who is in his 30s, is officially called 'Case 38'. He's from the Wairarapa and works at the Carterton District Council.

After playing his cricket match for the Kapiti Old Boys Second XI, he fell ill and tested positive for COVID-19.

The Kapiti Old Boys Club told Newshub the infected man did everything right. He had no symptoms when he played and their players have gone into self-isolation.

"Hearing back from them this morning, four of them have returned negative results which is another great thing to see," Kapiti Old Boys Club secretary Craig Bowen said.

Notifications have also gone out to Kapiti College and there will be a deep clean of the changing room.

Kapiti College principal Tony Kane said there's a "remote possibility" a person could've contracted the disease after the team used the changing room.

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"If that could be the case for you and you have felt in the slightest unwell since then, you need to contact Healthline," he told Newshub.

"I have had contact from a mum who has a close relative who was in contact with that individual. She very sensibly let me know and is keeping her children at home."

The infected man moved around. He has been in Auckland, Wairarapa and the Kapiti Coast.

But the Ministry of Health's Director-General remained tight-lipped about the case.

"I don't have any further details on the Wairarapa case," Dr Ashley Bloomfield said.

"But obviously where we do think there is community spread and we can't identify the source of infection, then there is a lot of work that goes into actively tracing back through the chain."

It remains a real mystery where he picked the virus up.