The Advisory Committee on Immunization Practices (ACIP) at the Ministry of Health and Welfare held an expert meeting on November 28 and gave recommendations for the use of a third dose in adults. The ACIP recommends that elderly people aged 65 and older, residents and staff in long-term care facilities, medical personnel, epidemic prevention and control staff, front-line workers at high risk of infection, and individuals at high risk of infection or with severe illnesses (i.e. the ninth priority group the government-funded COVID-19 vaccination program) should receive a third dose of COVID-19 vaccine six months after their second dose. Other individuals aged 18 and older can get a third dose to gain better protection after a physician's assessment and after evaluating their risk of infection and willingness to get vaccinated. The ACIP also recommends that adolescents aged 12-17 who have received their first dose of BNT and didn't experience serious adverse reactions get their second dose, and a minimum interval of 12 weeks is recommended between the first and second dose.

Source1, source 2.

See also the Taiwan CDC website for the latest news on COVID-19：https://www.cdc.gov.tw/En