Bacteria that infect people are transmitted through direct or indirect contact. To understand either of them much easier, imagine that bacteria live in mobile homes. Some bacteria are agoraphobic and can’t really survive outside their mobile homes for too long. Others, however, can survive outside for some time, but miss the comfort of their mobile homes so much that they really can’t thrive without these homes.
Now, imagine that, while the bacteria love their current mobile home, they’re always looking for a new one. Once the bacteria have found a suitable new mobile home, direct transmission is the only way the first type of bacteria—the agoraphobic variety—can move in. This basically means parking right up to the new mobile home and quickly hopping between homes, as if they haven’t gone outside.
http://ushxworkssnsc.wordpress.com/2014/01/16/north-side-spokane-urgent-care-how-bacterial-infections-multiply/
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