[ExI] Mysterious brain infection makes bears act 'like friendly dogs'

[John Grigg]

"A mysterious neurological disease in young Californian black bears (*Ursus
americanus*) is making them behave like pet dogs, cozying up to humans in a
friendly manner.

Though it sounds cute, this abnormal behavior dramatically worsens the
bears' chances of surviving in the wild.

The *bears* <https://www.livescience.com/27647-bears.html>, which are all
around 1 year old, appear to be suffering from a form of infectious
encephalitis — inflammation of the brain tissue that can be caused by
*viruses* <https://www.livescience.com/53272-what-is-a-virus.html>,
*bacteria* <https://www.livescience.com/51641-bacteria.html>, *fungi*
<https://www.livescience.com/53618-fungus.html> and parasites, as well as
part of an autoimmune response. But veterinarians are unsure exactly what
is causing the problem or how fast it is spreading among the population."
https://www.livescience.com/mystery-disease-fearless-californian-bears.html
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