The Asthma and Respiratory Foundation is recommending self-isolation for anyone with a serious underlying respiratory condition.
It comes after another 13 people tested positive to Covid-19 in this country.
That brings the total number of cases to 52 - with another four probable cases.
Director-General of Health Dr Ashley Bloomfield says two of the cases had not travelled overseas - so they're investigating the possibility of community transmission, something they've been preparing for.
He says it's now more important than ever to continue tracing individuals who have been in contact with them, to contain further spread.
Dr James Fingleton is a respiratory physician and on the Science Advisory Board for the Foundation. He joined Andrew Dickens to discuss why those with health conditions should be staying at home.
LISTEN ABOVE
Take your Radio, Podcasts and Music with you