The vero cells are apposition-dependent fibroblasts. They include inactivated encephalitis B vaccine, inactivated new coronavirus vaccine and inactivated enterovirus 71 vaccine, etc. The number of times it is necessary to take the vaccine is different due to different vaccines. 1. Inactivated encephalitis B vaccine: P3 strain of encephalitis B virus cultivated in vero cells is inactivated by formaldehyde, concentrated and purified, and then lyophilized. Clinically, it is used to prevent epidemic hepatitis B encephalitis. The basic immunization should be injected twice with an interval of 1 week. After the second injection, a third injection can be given within 1 month to 1 year as booster immunization. 2. New Crown Vaccine vero cell is an inactivated vaccine, which is made after culture inactivation, purification and adjuvant adsorption. It mainly prevents diseases caused by new coronavirus. The new coronavirus inactivated vaccine should be administered in 2 doses, with an interval of at least 3 weeks between injections and preferably within 8 weeks. 3. Enterovirus 71 inactivated vaccine: It is used to prevent hand, foot and mouth disease caused by EV71 infection. The inactivated enterovirus 71 vaccine is given in 2 doses, with the second dose given at 1-month intervals. Within 24 hours after vaccination, patients may experience adverse reactions such as pain, redness and swelling at the injection site, which disappear on their own within a short period of time. If you feel unwell after vaccination, you should go to the hospital promptly.