Do teachers and students in Yang Er need to be isolated?

No need for isolation. According to the national epidemic network, if the patient is asymptomatic after the second infection with novel coronavirus, and only shows positive antigen test or nucleic acid test, this situation does not need to be isolated. It is recommended to wear a mask in time when going out, and do a good job of protection to avoid infecting others. If the symptoms are serious, you need to go to the respiratory department of a regular hospital in time to avoid delaying your illness.