Quadrivalent meningitis vaccine can also achieve a certain preventive effect if you are over 18 years old, and you can decide whether to take the supplemental vaccine according to your own situation under the guidance of your doctor. Meningitis is a disease caused by meningococcal infection. Quadrivalent meningitis vaccine is usually used for children over 2 years old, and children are the group of people with higher incidence of meningitis. Quadrivalent meningitis vaccine can effectively prevent epidemic meningitis caused by ACYW meningococcal infection in children. Adults over 18 years of age can also receive the quadrivalent meningitis vaccine, but because meningitis mainly occurs in children and rarely occurs in adults, adults can receive the vaccine under the guidance of their own doctors, or they may not receive the vaccine. Quadrivalent influenza vaccine is a self-funded vaccine, so you can go to a vaccination center to get it at your own expense.