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Secondary ivermectin poisoning in South American green snakes (Philodryas baroni)
  1. Alicia Hahn,
  2. Jennifer D'Agostino and
  3. Gretchen A Cole
  1. Veterinary Hospital, Oklahoma City Zoo, Oklahoma City, Oklahoma, USA
  1. Correspondence to Alicia Hahn, ahahn{at}


This report describes three captive South American green snakes (Philodryas baroni) that suffered secondary ivermectin toxicity after ingesting mice exposed to a mistakenly over-concentrated medicated feed. Two snakes were found dead and the third was found moribund but revived with supportive care. Brain concentrations in mice and the two deceased snakes supported ivermectin toxicosis.

  • ivermectin
  • toxicity
  • South American green snake
  • philodryas baroni
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