2)在美国(the United States of America,USA)的一项流行病学研究中(1998年至2015年),Wendorf及其同事报告了17名SSPE患者。5岁以前发生麻疹的SSPE发病率为1:1367,婴儿时期发生的SSPE发病率为1:60911。在预防接种前时代,即使是发达国家,SSPE的发病率也非常高。
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