English: NMH school document requires student entering summer school to receive meningococcal polysaccharide vaccine or meningococcal conjugate vaccine. What kind of vaccine is it? Does Chinese student typically have taken before in China based on your experience? Thanks.

Chinese: 麻省的夏校NMH，文件说他们州里有个免疫针的规定，要求过去5年内打过meningococcal polysaccharide vaccine, 或者任何时候 打过meningococcal conjugate vaccine, 两者打过一种就可以，请问这是什么疫苗啊， 我们国内的孩子以前的防疫针中有包含吗？ 谢谢了。