"This concept of the bubble is something that's picking up, and people are quite fascinated by it.
"It's a great example of how to communicate to the public ... in terms of how people can take responsibility for limiting transmission."
He said from the organisation's perspective, New Zealand had avoided the type of battle between economic and public health interests that other countries had experienced.
If there was a second wave in New Zealand, he said the organisation would advise against further lockdowns, which would be too much for many people to take.
That's where the importance of contact tracing came in.
"If we have really good systems of contact tracing ... it means we don't have to do these heavy measures again," he said.
"So [New Zealand] still needs to be preparing contact tracing systems in case there is a surge in cases, and the public needs to maintain that individual responsibility."
There are no new cases of Covid-19 in New Zealand for the 19th straight day.
There are still no active cases.
On a larger scale, Griffith compared New Zealand to South Korea and Japan - both of which are through the worst of their outbreaks but are still seeing new clusters pop up as they reopen.
"What New Zealand can learn from countries like South Korea and Japan is that ... it's not yet time to be complacent and loose," he said.
"But a sign of clusters can actually be a good thing - because it represents how that country has gotten through the worst of community transmission, and is able to focus on specific outbreaks."
