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迄今的教科书一致认为:白喉杆菌的侵袭力极弱,其致病力取决于是否产生外毒素;对动物或Elek平板毒力试验不产生毒素的杆菌株称为无毒株
Textbooks so far agreed that diphtheria bacilli have a very low invasiveness and their pathogenicity depends on whether exotoxins are produced or not; strains of bacilli that produce no toxins for animal or Elek plate virulence tests are called non-virulent strains