Merck Manual

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WNV encephalomyelitis, horse
wnv_encephalomyelitis_horse_combo_high
WNV encephalomyelitis, horse

    Horse with WNV encephalomyelitis: tester is able to easily displace the horse to the left on pulling its tail (left); tester is unable to displace the horse at all to the right, demonstrating asymmetrical weakness (right).

Courtesy of Dr. Maureen Long.