Why did you give me the yellow code after leaving Hefei for a week?

No nucleic acid was produced. Because I didn't do nucleic acid, I left Hefei for a week and coded myself yellow. I left Hefei for a week without nucleic acid and turned myself yellow. Hefei is the capital of Anhui Province. Hefei is the political, economic, cultural, information, transportation, financial and commercial center of Anhui Province.