Japan has detected its first cases of the BA.4 and BA. 5 omicron subvariants of the coronavirus in airport screening, the health ministry said Thursday.

There were two cases of the BA.5 subvariant, found in a man in his 60s arriving at Narita Airport from Zambia and another man in his 60s arriving at Narita from Spain. Both individuals arrived on April 29 and were asymptomatic.

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