本文作者对1944～1988年间美国芝加哥大学皮肤科门诊中的39 270份培养阳性标本进行分析,结果如下:1850～1950年间美国城市中头癣病人的主要致病菌为奥杜盎小孢子菌,而在1940年约占60%～80%,在以后的20年中该菌渐渐减少,到70年代中期这个源于北欧的病原菌完全消失。在50年代中期及60年代为源于南部欧洲的致病菌 The authors analyzed 39,270 cultures of positive specimens from the Department of Dermatology at the University of Chicago in the United States from 1944 to 1988 and found the following: The major pathogens of the patients with tinea capitis in the United States between 1850 and 1950 were Microsporum, In 1940 about 60% to 80%, in the next 20 years, the bacteria gradually reduced to the mid-70s, the Nordic-origin pathogens completely disappeared. In the mid-1950s and 1960s, pathogenic bacteria originated in southern Europe