Shenzen abuts Hong Kong, which is also struggling with its outbreak.
China has shut down the southern business centre of Shenzhen
- city of 17.5 million people
- everyone in Shenzhen will undergo three rounds of testing
- all businesses except those that supply food, fuel and other necessities were ordered to close or work from home
Is also restricting access to Shanghai by suspending bus services.
I posted earlier on this, here for more