Safety Evaluation of Meningococcal Group ACYW135 Conjugate Vaccine in 2-month to 55 Years Old Population.

Inclusion Criteria: * Healthy children, adolescents and adults (age range: 2 months to 55 years old) based on medical history, physical examination or judgement of the investigator * Subjects aged ≥18 years old voluntarily agree to participate in this clinical study and sign the informed consent form; or for subjects aged \<18 years old, the legal guardian voluntarily agrees that his/her child to participate in this clinical study, and sign the informed consent form. For juveniles aged ≥8 years old, both the subject and his/her legal guardians should voluntarily agree to participate in this clinical study and sign the informed consent form. * The subject and his/her legal guardians as well as the family members are able to follow the request of clinical study protocol. * Subjects aged 2 or 3 months should have no vaccination history of any meningococcal vaccine; subjects aged 7\~23 months should have not received any other meningococcal vaccine except the meningococcal group A polysaccharide vaccine included in National Immunization Program, and the time since last vaccination of meningococcal group A polysaccharide vaccine should be \>6 months; for subjects ≥2 years, the time since last vaccination of meningococcal vaccine should be \>2 years. * For subjects aged ≥2 years, there should be no clinically significant abnormal hematology, liver and renal function results judged by the investigator before immunization. * Subjects should not receive any attenuated live vaccine 14…