9McCarthy A E, Victor G,Ramotar K,et al. Risk factor for acquiring ampicillin-resistant enterococci and outcomes at a Canadi-an tertiary-care hospital [ J]. J Clin Microbiol, 1994,32( 11) :2617 - 2676.
10FullerR. A review:probiotics in man and animals[ J]. J Appl Bacteriol, 1989,66:365 -378.