China is relaxing its coronavirus lockdowns, but the rules are still more restrictive than US cities under quarantine

Wuhan residents must use a coronavirus smartphone app that allows the government to track their health status and travel history to determine where they can go.

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The software generates a color code: green (you're healthy), yellow (you've had contact with another infected person), or red (you're infected). Only those with a green code can travel.

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In the US, some state authorities have begun checking for people fleeing hotspots like New York, but travel within states has been much less tightly controlled.

Some American technology companies have built software tools to help public health authorities track the virus, but the US hasn't implemented anything close to resembling China's government-mandated app.

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Airline and train station employees have also been checking people's temperatures as they board public transportation to identify potential carriers of the disease.

Some "essential" businesses that remain open in the US during the pandemic have begun conducting temperature checks on their workers, though it's not clear how widespread the measure is for Americans.

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While businesses have started to reopen in Wuhan, the city's schools remain closed, people are still sheltering at home, and the crisis is far from over.

In the US, the lack of a cohesive nationwide strategy has left some states lagging in their response to the virus, and experts warn the worst is still to come.

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