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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，文件說(shuō)他們州里有個(gè)免疫針的規(guī)定，要求過(guò)去5年內(nèi)打過(guò)meningococcal polysaccharide vaccine, 或者任何時(shí)候 打過(guò)meningococcal conjugate vaccine, 兩者打過(guò)一種就可以，請(qǐng)問(wèn)這是什么疫苗啊， 我們國(guó)內(nèi)的孩子以前的防疫針中有包含嗎？ 謝謝了。