The United States has extended the requirement for all foreign travelers to be fully vaccinated against COVID-19 before entering into the country.

The government requirement was scheduled to expire on Jan. 8. According to an amended order from the Transportation Security Administration, that date has been pushed back and will now expire on April 10. The order applies to non-citizens and non-immigrants.

The president issued the proclamation on Oct. 25, 2021, restricting entry into the U.S. for foreigners without proof of vaccination.

The extension is was fueled from concern in the rise of resurgence in the virus as China once again struggles with a major outbreak. Another factor was reports of a new omicron subvariant that has caused concern with health professionals.

The Centers for Disease Control reports that XBB.1.5 has caused over 40% of new coronavirus infections in the United States, but there is no reason that XBB.1.5 causes more severe illness than previous variants.