Is it necessary to isolate from Haikou to Tunchang now?

No need.

1. Those who enter Tunchang from low-risk areas and those who return to Tunchang within 7 days after coming to Tunchang (counting from the day when they leave the low-risk areas) shall go through the boarding (car or ship) formalities within 48 hours with the negative report of 1 nucleic acid test; On the third day after entering Tunchang, 1 nucleic acid was detected.

2. All personnel who come (return) to Tunchang Pass shall take measures such as temperature measurement, code scanning, health examination and card handling, and shall be released after landing inspection.