The Chinese center for disease control and prevention (CDC) said China has set up three lines of defense against the possible impact of COVID-19 imported cases, including surveillance at entry points and quarantine observation.

The CDC's first line of defense is customs screening; the second line of defense is placement into isolated observation for 14 days; the third line of defense is the transfer of symptomatic patients to a hospital to be reviewed by a medical doctor.

So far, imported cases from China have largely been stuck in the first and second phases, while no one has yet to reach the third phase, suggesting that the three lines of defense are well positioned to prevent the re-emergence of COVID-19 imported cases.

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