People who are in unprotected close contact with a confirmed or suspected case. The case’s contacts from the last four days before the symptoms showed up will be tracked down.
People who have had unprotected close contact with an asymptomatic case. The infected person’s contacts from the last four days before the case tested positive will be tracked down.
People who have been exposed to a potentially contaminated environment.
Measures:
Two weeks of central quarantine and another week of health observation.