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正常菌群转变为机会致病菌已经成为众人关注的难题，潜生体的研究有助于认识机会致病菌的形成，确定的非周期性揭示了常规方法研究的困难所在。微生物学是从对致病微生物的研究开始的，约１００年前Ｋｏｃｈ将微生物分成致病微生物和正常微生物群。近一个世纪的时间，人们重点
The transformation of normal flora into opportunistic pathogens has become a concern for all people. The study of longevity helps to recognize the pathogens of pathogens, and the definite aperiodicity reveals the difficulties in the research of conventional methods. Microbiology started with the study of pathogenic microorganisms. Koch separated the microorganisms into pathogenic and normal microflora about 100 years ago. Nearly a century of time, people focus