Oranga Tamariki minister and NZ First MP Tracey Martin met with Australia's Minister for Home Affairs Peter Dutton during a Five-Eyes partners meeting in Washington DC.
Dutton had no symptoms of the coronavirus at the time but woke up with a temperature and sore throat yesterday.
He has since revealed he has tested positive for coronavirus and is in hospital.
A spokesperson for Martin said she had shown no symptoms, but was self-isolating until test results were returned.
He said she also did not shake Dutton's hand when she was overseas.
Meanwhile, Black Caps fast bowler Lockie Ferguson is in quarantine after suffering a sore throat following Friday's loss to Australia in the opening one-dayer.
The seamer has been tested and is isolated at the Black Caps team hotel.
The three match Chappell Hadlee series is being played at empty stadiums due to the Covid-19 coronavirus.
New Zealand has six confirmed coronavirus cases but no deaths.
