Beginning Tuesday, travelers will be required to take a coronavirus test within 48 hours of traveling to Britain regardless of their vaccination status, and imposed restrictions on travelers from Nigeria, the country’s health secretary said in a statement. Nigeria announced on Wednesday that it had detected the variant in three travelers who arrived from South Africa in November, according to Dr. Ifedayo Adetifa, the director general of the Nigeria Centre for Disease Control…

At the moment, travelers are required to self-isolate and take a coronavirus test on the second day after arriving. If that test is negative, they can end their isolation. If not, they are expected to remain in self-isolation until they do get a negative result.

There are now 160 confirmed cases of the Omicron variant across Britain, Britain’s Health Security Agency confirmed on Saturday, up from 134 cases reported by the agency on Friday. Britain is considered a leader in genomic sequencing and testing, with a well-run national program to track coronavirus mutations, so it has an advantage in tracking the variant’s spread.