A group of experts have declared our mask guidelines inadequate - most notably for those working on the frontline.
The Centre for Informed Futures at Auckland University say we're not keeping pace with the latest international studies and it's leaving gaps that can be exploited by Covid-19's Delta variant.
A fresh report urges all essential and border workers don proper-fitting N95 masks - and identifies shortcomings in the general public's mask-wearing methods.
University of Auckland aerosol scientist Joel Rindelaub spoke to Susie Ferguson.