The Ministry of Health issued a question and answer on influenza A vaccination, indicating that there are currently three groups of people who are clearly prohibited from receiving the vaccine. The first is children under 3 years of age. The influenza A vaccine currently approved for use in China is for people over 3 years of age, and clinical trials have only been conducted in people over 3 years of age, and there are no data on the safety and efficacy of the influenza A vaccine for children under 3 years of age. Secondly, the contraindications for influenza A vaccine are acute illness, severe chronic illness, and acute exacerbation of chronic illness, so if a patient with nephrotic syndrome is in acute exacerbation or is in severe condition, vaccination should be prohibited. Third, people who are allergic to the common seasonal influenza vaccine should not receive influenza A vaccine; vaccine recipients with a history of egg allergy, vaccination allergy and other serious allergies are prohibited from receiving influenza A vaccine, and those with other allergies should decide carefully whether to receive influenza A vaccine under the guidance of a clinician.