さて、使用上の注意はどうなっているかをみると - Medical treatment and supervision are necessary in the event of a rare anaphylactic event during vaccine administration. - Vaccine administration should be postponed for patients suffering from acute severe febrile illness. - Patients receiving anticoagulant treatment or with a bleeding disorder that contraindicates intramuscular injection should be given the vaccine only if the benefit outweighs the risk of inoculation. - Immunocompromised patients may see a diminished immune response to the vaccine. - The vaccine may not protect all recipients. - No data are available regarding the use of the Pfizer vaccine in people who have received another COVID-19 vaccine.