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Tokyo 2020 could isolate and test people arriving at the Olympic and Paralympic Games, should anyone on their flight test positive for COVID-19.
Tokyo 2020 Games delivery officer Hidemasa Nakamura suggested rules would be strengthened, following the two positive cases recorded by a Ugandan delegation who arrived earlier this month.
A nine-member group from Uganda arrived on June 18, with a team coach testing positive on arrival at Narita International Airport, despite reportedly being fully vaccinated with the AstraZeneca vaccine and testing negative before he landed.
The individual was later found to have tested positive for the Delta variant of COVID-19, which is thought to be between 40 to 60 per cent more transmissible.
The remaining party had been able to travel by bus to their hotel in their host town, Izumisano in Osaka Prefecture.
The entire delegation and a city official were later deemed to have been in close contact and were asked to remain in their hotel and refrain from training until July 3.
A second positive was later confirmed.
This prompted calls for stronger COVID-19 countermeasures for arrivals into Japan for the Olympic Games, with Tokyo 2020 President Seiko Hashimoto promising to tighten measures.
Nakamura has indicated all passengers to have travelled with an infected person could be deemed close contacts, should a positive case be reported on arrival.
The International Olympic Committee (IOC) and Tokyo 2020 organisers will implement a series of strict rules during the Games, which they claim will ensure the Olympics and Paralympics are safe and secure.
This includes a reduction in the number of accredited officials and banning visits to tourist areas.
A total of 78,000 people are expected to enter Japan for the Olympic and Paralympic Games.
This would include 59,000 people for the Olympics, compared to the expected 180,000 from last year.
The number will include 23,000 Games-related officials, including from the IOC and International Federations.
Olympic Broadcast Services representatives and rightsholders account for 17,000 people during the Olympics, with 6,000 members of the media expected.
Around 19,000 people are expected for the Paralympic Games, including 9,000 officials, 4,000 for broadcast and 2,000 media.
Everyone coming from overseas will be required to abide with measures outlined in playbooks published by organisers, along with local officials.
The IOC has also claimed more than 80 per cent of people inside the Athletes' Village will either have been vaccinated or be in the process of inoculation in time for the Games.
The Tokyo 2020 Olympics are scheduled to take place from July 23 to August 8, followed by the Paralympics from August 24 to September 5.