8Blumberg H M, Stephens D S, Lieitra C,et al. Molecular epidemiology of group B streptococcal infections: use of rcstriction endonuclease analysis of chromosomal DNA and DNA restriction fragment length polymorphisms of ribosomal RNA genes (ribotyping)[J]. Infect Dis, 1992, 166(3): 574-579.
9Tenover F C, Arbeit R D, Goering R, et al. Interpreting chromosomal DNA restriction paternsproduced by pulsed-field gel electrophoresis : criteria for bacterialstrain typing[J]. Journal of Clinical Microbiology, 1995, 33 :2 233-2 239.