Is it isolated from Yulin to Dingbian?

No need. According to the official website of the Epidemic Prevention and Control Center, as of September 19, 2022, Yulin and Dingbian are low-risk areas and are normalized prevention and control in the city, so there is no need to quarantine from Yulin to Dingbiande. You only need to hold a 48-hour nucleic acid negative certificate to enter. After completing two nucleic acid tests within 3 days after arrival, you can continue your normal activities if both results are negative.