Travel restrictions and advisories

A child wears a mask with a tiger imprint as he visits Jingshan park during a snow day in Beijing Tuesday, Jan. 19, 2021. China is now dealing with coronavirus outbreaks across its frigid northeast, prompting additional lockdowns and travel bans. (AP Photo/Ng Han Guan)

FILE. In this Jan. 31, 2020 file photo passengers arrive to embark on the last Eurostar train at Gare du Nord Station in Paris. The chief of France's state rail the SNCF, which owns 55% of Eurostar, has sounded the alarm for the future of the train service that connects the UK with continental Europe. (AP Photo/Francois Mori, file)

FILE - In this Saturday, Dec. 26, 2020 file photo, people walk with their luggage through a deserted check-in hall at the airport in Munich, Germany as Germany continues its second lockdown to avoid the further outspread of the coronavirus. On Tuesday, Jan. 12, 2021, the U.S. government said it will require airline passengers entering the country to show proof of a negative COVID-19 test before boarding their flights. It will take effect Jan. 26. (AP Photo/Matthias Schrader)

Italian tennis player Simone Bolelli, left, and Argentina's Maximo Gonzalez are escorted to their training session in Melbourne, Australia, Monday, Jan. 18, 2021. The number of players in hard quarantine swelled to 72 ahead of the Australian Open after a fifth positive coronavirus test was returned from the charter flights bringing players, coaches, officials and media to Melbourne for the season-opening tennis major. (Luis Ascui/AAP Image via AP)

This aerial photo shows Wuhan skyline, China, Thursday evening, Jan. 14, 2021. A global team of researchers arrived Thursday in the Chinese city where the coronavirus pandemic was first detected to conduct a politically sensitive investigation into its origins amid uncertainty about whether Beijing might try to prevent embarrassing discoveries. (AP Photo/Samuel McNeil)

Seema Rajgarh, 37, hawks jewelry made of beads and stones on nearly deserted Utorda beach in South Goa, India,, Dec.16, 2020. On good days during the holiday season, the mother of three girls, the youngest not yet two years old, said she used to make 2,000 rupees ( $27). Now, times are bleak. "Some days, I make barely 200 rupees ($2.7), not enough to even buy milk and food for my children," she said. "This virus has devastated our lives," Rajgarh said. Goans are mourning the loss of their livelihoods and possibly their way of life to the pandemic and travel restrictions. (AP Photo/Vineeta Deepak)

FILE - In this Saturday, Dec. 26, 2020 file photo, people walk with their luggage through a deserted check-in hall at the airport in Munich, Germany as Germany continues its second lockdown to avoid the further outspread of the coronavirus. On Tuesday, Jan. 12, 2021, the U.S. government said it will require airline passengers entering the country to show proof of a negative COVID-19 test before boarding their flights. It will take effect Jan. 26. (AP Photo/Matthias Schrader)

Visitors wearing face masks to help curb the spread of the coronavirus walk by Forbidden City in Beijing, Sunday, Jan. 10, 2021. More than 360 people have tested positive in a growing COVID-19 outbreak south of Beijing in neighboring Hebei province. (AP Photo/Andy Wong)

In this photo released by Xinhua News Agency, a medical staff in a protective suit prepares to take a swab from a child near a residential area in Shijiazhuang in north China's Hebei province on Wednesday, Jan. 6, 2021. Lockdown measures were being imposed in a northern Chinese province where coronavirus cases more than doubled in the region near Beijing that's due to host some events in next year's Winter Olympics. (Mu Yu/Xinhua via AP)

In this photo released by Xinhua News Agency, a medical staff in a protective suit prepares to take a swab from a child near a residential area in Shijiazhuang in north China's Hebei province on Wednesday, Jan. 6, 2021. Lockdown measures were being imposed in a northern Chinese province where coronavirus cases more than doubled in the region near Beijing that's due to host some events in next year's Winter Olympics. (Mu Yu/Xinhua via AP)