[Petrochemicals (OP)]

Whilst the lockdown Islands of Australia and New Zealand are experiencing in reaching case and Hong Kong is experiencing sporadic cases, the country of China, with long  borders, vaccination via the sinovac type vaccine, 1billion+ people, close to the origin of the delta strain whilst being the source of the original virus, maintains its almost perfect control of the virus.

[Bored chemist]

We only have their word for it that they are.
To they extent that it's real, the answer to
"How is China avoiding corona virus?" is probably "dictatorially".