InhaltsangabeBetween Commensalism and Pathogenicity:Bacterial and Host Aspects.- E. coli as an all-rounder: The thin line between commensalism and pathogenicity.- What distinguishes non-pathogenic, from medium and highly pathogenic staphylococci?.- Microevolution of Pseudomonas aeruginosa to a chronic pathogen of the cystic fibrosis lung.- Lactobacillus: Host-Microbe Relationships.- Bacterial Moonlighting Proteins and Bacterial Virulence.- Symbionts and pathogens - what is the difference?.-Host-microbe Interaction in the Intestinal Tract.- Ecology and physiology of the intestinal tract.- The gut microflora and its variety of roles in health and disease.- Mammalian intestinal host-microbe relationships.- Contribution of the intestinal microbiota to human health - from birth to 100 years of age.-  Subject index.