New Zealand has reported 20 local Covid-19 cases, the same as in the previous day, giving authorities more confidence that they are gaining a winning hand over the current outbreak of the highly transmissible Delta variant.

Officials said all the new cases were in Auckland, New Zealand's largest city and the epicentre of the outbreak. Daily case numbers have been declining over the past week, with the community outbreak now standing at 801 infections, Reuters reported.

“The ongoing fall in numbers is proving that alert level 4 in Auckland and our public health measures are rapidly slowing the spread of the virus, however, it is not through yet and we need to remain extra vigilant,” Director General of Health Ashley Bloomfield told a televised briefing.