Japan confirmed a new variant of Covid-19 and an infection cluster emerged at a Tokyo immigration facility, presenting new challenges as the country tries to overcome a third wave of the pandemic.

The new variant has been found in 91 cases in the Kanto area of eastern Japan and in two cases at airports, Chief Cabinet Secretary Katsunobu Kato told reporters on Friday.

The government is raising surveillance against mutant varieties as they may be more resistant to vaccines, which Japan started to distribute this week.

“It may be more contagious than conventional strains, and if it continues to spread domestically, it could lead to a rapid rise in cases,” Kato said.

The new strain appears to have originated overseas but is different from other types that have been found sporadically in Japan, according to the National Institute of Infectious Diseases.

It has the E484K mutation on the spike protein of the virus that has been found in other variants, which may undermine the effectiveness of vaccines.

Japan has reported 151 cases of variants from Britain, South Africa and Brazil, according to the health ministry. The nation has had more than 400,000 cases of Covid with 7,194 fatalities.

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