The first bacterial genome, Haemophilus influenzae, was completely sequenced, annotated, and published in 1995. Today, more than 200 prokaryotic (archaeal and bacterial) genomes have been completed and over 500 prokaryotic genomes are in va- ous stages of completion. Seventeen eukaryotic genomes plus four eukaryotic chro- somes have been completed. The concept of achieving better understanding of an organism through knowledge of the complete genomic sequence was first demonstrated in 1978 when the first bacteriophage genome, X174, was sequenced. Complete genomic sequences of prokaryotes have led to a better understanding of the biology and evolution of the microbes, and, for pathogens, facilitated identification of new vaccine candidates, putative virulence genes, targets for antibiotics, new strategy for rapid diagnosis, and investigation of bacteria-host interactions and disease mec- nisms. Recent increased interest in microbial pathogens and infectious diseases is largely attributed to the re-emergence of infectious diseases like tuberculosis, emergence of new infectious diseases like AIDS and severe acute respiratory syndrome, the problem of an increasing rate of emergence of antibiotic-resistant variants of pathogens, and the fear of bioterrorism. Microbes are highly diverse and abundant in the biosphere. Less than 1% of these morphologically identified microbes can be cultured in vitro using standard techniques and conditions. With such abundance of microbes in nature, we can expect to see new variants and new species evolve and a small number will emerge as pathogens to humans.

Probiotics in Pediatric Medicine provides clinicians a tool to understand the current evidence for the role of probiotics in various pediatric disorders related to the gastrointestinal as well as the extra-intestinal tract. This book provides evidence-based up-to-date information from world experts in their fields to help clinicians make decisions regarding the use of probiotics. A list of resources, web sites, and references relevant to probiotics can be found in the appendix. Currently, the market for probiotics continues to rely heavily on health claims made by manufacturers and retailers. Clinicians have the sole responsibility to understand the various strains and preparations commercially available and to advise patients accordingly. Probiotics in Pediatric Medicine is an indispensable tool and a critical resource for health professionals that will aid in enhancing their ability to make the appropriate decisions regarding the use of probiotics.