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First of all, China shut down all travel - both domestic and international - from Hubei province. For people outside of Hubei province, the government made international travel more difficult.

Second of all, what country has ever prevented its own citizens from leaving the country because of an outbreak? The Hubei lockdown was already the most dramatic response by a government in modern history to an outbreak. A province with 60 million people was put strict lockdown. Almost nobody was let out of the province, and people were told to stay in their homes.