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西藏那曲地区索县赤多乡9村系高原牧区，于1997年9月19日──12月21日发生一起流行性脑脊髓膜炎（流脑），该乡26户藏族牧民145人中共发病16例，死亡11例，发病率为11．03％，死亡率为7．59％，病死率为68．75％。发病共12户，1户五例的7户，占发病户数的58．33％；1户2例以上?
A series of epidemic cerebrospinal meningitis (meningitis) occurred on September 19, 1997 - December 21, 1997 in the pastoral area of 9 plateau, Chodo Township, Suqian County, Naqu Prefecture, Tibet. The incidence of CCP in 145 Tibetan herdsmen 16 cases, 11 died, the incidence rate was 11.03%, the mortality rate was 7.59% and the case fatality rate was 68.75%. Incidence of a total of 12 households, 1 in 5 cases of 7, accounting for 58.33% of the number of cases; 1 more than 2 cases?