Chris Bishop, National Party MP for Hutt South. Photo: NZ Herald

National Party MP Chris Bishop is going into self-isolation for coronavirus after returning from Australia.

Bishop returned to New Zealand on Saturday evening, after arriving in Australia on Friday morning.

"I have talked to Healthline, and their advice is that while I have no legal obligation to self-isolate (because the requirements do not kick in until 1am on Monday morning), they would prefer that I did so," Bishop wrote in an online post.

"I am following that advice. After I returned home last night I have confined myself to our house in Petone. I have no symptoms and am feeling totally fine."

It follows today's announcement that Green Party MP Chlöe Swarbrick will self-isolate for 14 days when she arrives back in New Zealand, after a weekend trip to Australia.

Chloe Swarbrick. PHOTO: APNZ

"I have been overseas and as such will be following the protocols outlined by the Prime Minister," Swarbrick said today.

"These protocols were designed to keep everyone healthy. I do not have any symptoms, but I am registering my whereabouts with the Ministry of Health and will be following advice."

NZ First MP Tracey Martin is also in self-isolation, after meeting with Australia's Minister for Home Affairs Peter Dutton during a Five-Eyes partners meeting in Washington DC.

Dutton had no symptoms of Covid-19 at the time, but woke up with a temperate and a sore throat on Friday. He has since tested positive foe the respiratory virus and is now in hospital.

A spokesperson for Martin said she had shown no symptoms, but was self-isolating as a precaution.