A total of two doses of the ac meningitis vaccine are required. The full name of the ac flu vaccine is group a group c meningococcal polysaccharide conjugate vaccine. The immunization schedule and dosage of this vaccine is 1 dose each at the 3rd and 6th week of age, and the dose of each dose is 0.5 ml per dose. Meningococcal Polysaccharide Conjugate Vaccine Group a Group c is a free class I vaccine and is intended for children two weeks of age and older, students, and those who are about to travel to a meningococcal endemic area. In order to be vaccinated with Group A Group C Meningococcal Polysaccharide Conjugate Vaccine, it is necessary to pay attention to whether the body meets the conditions for vaccination, such as being healthy with no history of allergy, no acute or chronic disease attack, etc. It is recommended that those who don’t meet the conditions for vaccination should be suspended or prohibited from being vaccinated.