On 20 May, the Central Epidemic Command Centre sent an outbreak alert message to people who had travelled to the COVID-19 area from 20 April to 19 May, spreading high-risk areas, as follows:

[The outbreak alert] If you have travelled to COVID-19 to spread high-risk areas and have subsequently had fever, respiratory symptoms, abdominal or sniffing, and abnormal taste disorders, please contact your local health care arrangements as soon as possible to evaluate them.

To reduce the risk of disease prevention in the school, if an outbreak alert is sent to the command centre, the Health Education Unit of the Health Department should be activated to report to the Health Department 05-5524106/School Security Centre 0537-651657 and follow the measures related to the disease.