http://unews.utah.edu/news_releases/how-insects-domesticate-bacteria/

University of Utah biologist Colin Dale swabs a petri dish containing a
bacterial culture. Dale and colleagues discovered a new bacterium isolated
from the infected wound of an Indiana man who impaled his hand on a tree
branch. They also found that the new bacterial strain, named HS, was
related to a group of bacteria that live inside insects in mutually
beneficial symbiotic relationships. The discovery solved an old mystery by
showing that insects domesticate bacteria by picking them up from plants or
animals in their environment, not from other insects.

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