VERO vaccines commonly include inactivated novel coronavirus vaccine, inactivated enterovirus 71 vaccine, inactivated encephalitis B vaccine, etc. The number of times of inoculation required for different vaccines varies as follows. 1. New type of inactivated coronavirus vaccine (Vero cell), vaccination can stimulate the body to produce anti-new type of coronavirus immunity, used to prevent diseases caused by new type of coronavirus. Generally, only 2 doses are required, and 3 doses are not necessary; the interval between doses is recommended to be ≥3 weeks, and the second dose should be completed as early as possible within 8 weeks. 2. Enterovirus 71 inactivated vaccine (Vero cell), vaccination can stimulate the body to produce anti-EV71 immunity, used for the prevention of hand, foot and mouth disease caused by EV71 infection. The basic immunization program is 2 doses with an interval of 1 month, but the need for booster immunization has not yet been determined. 3. Inactivated B encephalitis vaccine (Vero cell), vaccination can stimulate the body to produce immunity against B encephalitis virus, used for the prevention of epidemic B encephalitis. Basic immunization should be two injections at 1-week intervals; a third injection is given 1 month to 1 year after the second injection as booster immunization. Patients are advised to consult the local vaccination department for specific information about vero vaccine, and to learn about its contraindications and adverse reactions.