流行性脑脊髓膜炎 (下称流脑 )是由脑膜炎奈瑟氏菌 (Ｎｍ )引起的以化脓性脑脊髓膜炎为主要症状的急性呼吸道传染病。该病在我省自 5 0年代以来曾有三年出现大规模流行 ,其发病率均在 5 0 /10万以上 (下称流行年 ) ,其余年份发病率均低于 5 0 /10万 (下称非流行年 )。随着预防 Epidemic cerebrospinal meningitis (hereinafter referred to as “meningitis”) is an acute respiratory infection caused mainly by purulent meningitis caused by Neisseria meningitidis (Nm). The disease has been endemic for three years in our province since the 1950s with an incidence of more than 50 / 100,000 (hereinafter referred to as the “epidemic year”) and the incidence of the remaining years is less than 50/100 thousand Known as non-prevalent year). With prevention