Do I need to use a foreign health code when I transfer to Shenyang?

Need. Those who need to carry effective nucleic acid for 72 hours from Shenyang to Haikou prove that the health code will change color if the transit time exceeds 4 hours. So it is necessary for Shenyang to stay in Beijing for 3 hours before leaving the station. Health code is a personal two-dimensional code based on actual data, which is declared by citizens or people who have returned to work and generated after background audit.