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大面积使用地鼠肾细胞乙脑灭活疫苗以来,我国一些地区的乙脑年发病率里逐渐下降趋势.其下降的轨迹近似双曲线。对于这类地区乙脑疫情的预测,可采用双曲线数学模型。
Since the inactivated vaccine for JE of hamster kidney cells has been used in large areas, the annual incidence of JE in some regions in China has gradually declined. The descending trajectory is approximately hyperbolic. For the prediction of epidemic encephalitis in this type of area, a hyperbolic mathematical model can be used.