See also p 1061. Most affected kids have been in good condition and are 2–3 mo old (range 1 wk to 4 mo). Commonly, sudden death is associated with cardiac muscle damage. Other kids are depressed, reluctant to move, and appear stiff with a “sawhorse” stance or become recumbent. Muscles, especially of the hindlimbs, are firm and painful to the touch. Treatment is with selenium and vitamin E injection in acute cases.

Last full review/revision March 2012 by David M. Sherman, DVM, MS, DACVIM