About outbreak of new coronavirus infectious disease positive person of Inagi City school staff (January 7, 2022)

A faculty member working at an Inagi City school was found to be positive as a result of a new coronavirus test.
The situation regarding the concerned faculty and staff members is as follows.
(1) Age: 40s (2) Gender: Female (3) Place of residence: Tokyo (4) Symptoms: No fever, cough and phlegm (5) Circumstances: Friday, December 24, 3rd year of Reiwa, the last day of work. Since then, no work due to taking vacation.
On January 3, 2020 (Monday), an acquaintance who had a dinner together during the vacation was found to be positive.
On Tuesday, January 4, 2020, I visited a hospital and performed a PCR test.
On Thursday, January 6, 2022, the person himself was found to be positive.
　　　　　　　　　　　　　 From the public health center, there is an instruction to wait at home for medical treatment until January 13, 2020 (Thursday).