And when it does, it raises question of epistemology:
"...the majority of transmission events are due to the owner transmitting
the disease..."

"Modeling the spread of American foulbrood in honeybees"
Datta, Bull,  Budge, and Keeling
Journal of the Royal Society
Sept 11, 2013

http://rsif.royalsocietypublishing.org/content/10/88/20130650.full.pdf+html
or
http://tinyurl.com/kboojmx

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