COVID-19 mRNA vaccine from Pfizer BioNtech COMIRNATY (Tozinameran) orange cap; Dosage and route of administration: 0.2ml per dose. Three doses. The second dose should be administered 21 days after the first dose, if there is a delay, administer as soon as possible. Third dose: 5 months after the first dose, if there is a delay, administer as soon as possible; Children with moderate to severe immunosuppression: 4 doses; 2nd dose: 21 days after the 1st dose; 3rd dose: 4 weeks or 28 days after 2nd dose; 4th dose: 3 months after the 3rd dose; Route of administration: Intramuscular in the deltoid muscle.