Recent revelations about a highly contagious COVID-19 mutation, which slipped into Japan due to loose quarantine measures for people involved with the Tokyo Olympics, have prompted the organizers to introduce extra measures aimed at preventing any further spread linked to Olympic delegations.

Under pressure from opposition parties, the government has revealed that so far six people related to the games have entered Japan while infected with the delta mutation of the SARS-CoV-2 virus.

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