Table 3. Aberrations detected in ambulance transfer surveillance during the Tokyo 2020 Olympic and Paralympic Games, by detection and reporting date, 6, 16, 20 July and 22 August 2021.

Detection and reporting date	Situation	Investigation required at medical institution	Reason for not requiring investigation	Follow-up
6 July 2021	On 5 July at 14:00, three people in a city ward were rushed to the emergency department with fever, diarrhoea and vomiting	Not required, but monitoring was continued	All cases had mild symptoms and were presumed to be from one family	No further aberration
16 July 2021	On 15 July at 01:00, five people in a city were rushed to the emergency department with diarrhoea and vomiting	Not required, but monitoring was continued	All cases had mild symptoms and were presumed to be from one family	No further aberration
20 July 2021	On 19 July at 09:00, three people in a city were rushed to the hospital for fever and vomiting	Not required, but monitoring was continued	All cases were presumed to be from one family	No further aberration
22 August 2021	On 21 August at 10:00–11:00, three fever cases with COVID-19 were transported to medical facilities	Not required	The patients were being transported from a COVID-19 residential treatment facility to hospital	Not required
22 August 2021	On 21 August at 11:00–20:00, five fever cases with COVID-19 were transported to medical facilities	Not required	The patients were being transported from a COVID-19 residential treatment facility to hospital	Not required