Microorganisms are everywhere. They are found throughout the environment and by the billions on the skin and in the gastrointestinal and respiratory tracts. Most are quiescent, colonizing the host without producing disease or prevented from doing so by the body's normal ...

  • Loading...
locked icon

Sign in to access this content

Get a 30 day FREE TRIAL

  • Watch videos from a variety of sources bringing classroom topics to life
  • Read modern, diverse business cases
  • Explore hundreds of books and reference titles