One of New Zealand's top Covid-19 modellers says using the Covid Tracer app is extremely important, even though the country is at Alert Level 1.
The warning comes after the appearance of a new case of Covid-19 in a ship worker and the number of scans on the app dropped below one million a day.
Shaun Hendy is a professor at the University of Auckland and has been a key part of New Zealand's scientific response to the pandemic.
