A further 37 people have tested positive for coronavirus in New South Wales overnight, bringing the state total to 171.

Of the 171, 67 were infected overseas, 44 were transmitted locally, 43 are under investigation and the remaining 17 are impossible to determine.

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There are also 1,282 cases currently under investigation.

More than 25,000 tests have been carried out in NSW.

State Health Minister Brad Hazzard says the number of new cases was a “dramatic increase” and gave an insight into how the coming weeks could unfold.

“It is starting to look as if there will be a fairly substantial, what would understand to be, an exponential increase in numbers over the next few weeks,” he said.

Among the new cases are six wedding guests at who attended a ceremony Tumbling Waters Retreat in Stanwell Tops on March 6.

Other guests deemed close contacts are being followed up by authorities.

NSW chief health officer Dr Kerry Chant with NSW Health Minister Brad Hazzard. Credit: AAP

An infectious person also attended Oakvale Winery in Polkolbin.

Anyone who visited the winery between March 4 and March 13 is being encouraged to remain vigilant for symptoms of coronavirus.

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Several of the new cases had recently travelled by plane, Hazzard said.

He made requests for the following passengers to make contact with NSW health authorities: