http://en.wikipedia.org/wiki/Bacteria
Each species of pathogen has a characteristic spectrum of interactions with its human hosts. Some organisms, such as Staphylococcus or Streptococcus, can cause skin infections, pneumonia, meningitis and even overwhelming sepsis, a systemic inflammatory response producing shock, massive vasodilation and death.Yet these organisms are also part of the normal human flora and usually exist on the skin or in the nose without causing any disease at all.
Each species of pathogen has a characteristic spectrum of interactions with its human hosts. Some organisms, such as Staphylococcus or Streptococcus, can cause skin infections, pneumonia, meningitis and even overwhelming sepsis, a systemic inflammatory response producing shock, massive vasodilation and death.Yet these organisms are also part of the normal human flora and usually exist on the skin or in the nose without causing any disease at all.
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