Potential coronavirus second wave has China on high alert

As the number of novel coronavirus cases slows to a trickle within China but continues to soar outside, Chinese authorities are stepping up measures to prevent a surge in cross-border infections. CNN's David Culver reports.

Potential coronavirus second wave has China on high alert
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As the number of novel coronavirus cases slows to a trickle within China but continues to soar outside, Chinese authorities are stepping up measures to prevent a surge in cross-border infections. CNN's David Culver reports.