This is related to their contact time. These control measures include the wearing of masks, whether to vaccinate, whether the infected person has a negative nucleic acid test report, etc.
This is related to their exposure time. These control measures include the wearing of masks, whether they are vaccinated, whether the infected person has a negative report of nucleic acid test, etc
This is related to their contact time, and these control measures include the wearing of masks, whether to vaccinate or not, and whether the infected person has a negative report of nucleic acid test, etc.