1998年 4月 5～ 2 0日甘南县长山乡出现以发热、咽峡炎、全身弥漫性红疹等为主要临床表现的病人 5 1例 ,发病率为 6 39%。其中乡直 5例 ,罹患率 3 6 8‰ ;新升村 6例 ,罹患率 3 47‰ ;向阳村 1例 ,罹患率 0 45‰ ;建华村 1 3例 ,罹患率 9 77%。四方山村 2 6例 ,罹患率 1 9 0 On April 5-20, 1998, 51 patients with fever, angina and systemic diffuse rash appeared as the main clinical manifestations in Changshan Township, Gannan County, with a prevalence of 639%. Among them, 5 cases were rural directly affected with an attack rate of 368%, 6 cases were newly established villages with an attack rate of 477%, 1 case with Xiangyang and 0 45% o Jianhua village with an attack rate of 977%. There were 26 cases in Sifangshan Village with an attack rate of 190