Japan has confirmed that a new variant of Sars-COV-2 with the E484K mutation on the spike protein has been found in 91 patients.
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 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.
