Why China won't let go of COVID-zero

While isolation rules lift here tomorrow, in China the Government is doggedly pursuing a zero-COVID policy with cities still being locked down with almost no notice.  For President Xi Jinping, keeping COVID out has been a platform of his leadership as he prepares to be endorsed for an unprecedented third term at the Communist Party's Congress that begins on the weekend.  Today, East Asia Correspondent, Bill Birtles on how much longer China can stay out of step with the rest of the world.  Featured: Bill Birtles, ABC East Asia correspondent