The U.S. has reclassified its travel advisory alert for Singapore to "unknown".
The move was made by the U.S. Centers for Disease Control and Protection (CDC) on Jan. 4.
It also suggested that travel to Singapore should be avoided.
Other countries whose status are at the same classification include North Korea, Yemen, Syria and Afghanistan.
The advisory said, "Because the current situation in Singapore is unknown, even fully vaccinated travellers may be at risk for getting and spreading COVID-19 variants."
CDC: You should travel to Singapore only if you are fully vaccinated
In addition, travellers from the U.S. should enter Singapore only if they are fully vaccinated.
As for entry into the U.S., all travellers are required to show a negative Covid-19 test result taken no more than a day before arrival, with only children below two years old exempted.
All travellers are also required to provide contact information to airlines before boarding flights to the U.S. to allow federal, state, and local authorities to share health-related information.
Previously given the maximum risk
Singapore had previously been given the maximum risk level of "Very High" by the CDC on Oct. 18, 2021.
Less than a month before, on Sep. 27, the danger level was raised from "Moderate" to "High".
On Jan. 4, Singapore reported 842 new cases of Covid-19, of which 438 were cases infected with the Omicron variant.
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Top image via Changi Airport Facebook