Bacteria keeps us healthy?

Did you know that you probably have over one hundred trillion good bacteria in your body right now? Did you know that they are essential for human life, providing barricades against disease-forming bacteria, needed to digest food, and to synthesize certain vitamins? There are over one thousand strains of bacteria on each of us. Read more here: http://www.nytimes.com/2012/06/14/health/human-microbiome-project-decodes-our-100-trillion-good-bacteria.html?_r=1&ref=bacteria