Moldy walnut toxicosis in a dog, caused by the mycotoxin, penitrem A

Area of Science:

• Mycology
• Veterinary Toxicology
• Food Safety

Background:

• Mold contamination of food products can lead to the production of mycotoxins.
• Penitrem A is a potent neurotoxin produced by certain Penicillium species.
• Animal intoxications are often linked to the consumption of contaminated feed or food items.

Observation:

• A dog in California experienced an intoxication event linked to consuming moldy walnuts.
• Moldy walnuts were identified as the likely source of the toxic agent.
• The presence of a specific mold was suspected as the causative agent.

Findings:

• Penicillium crustosum was successfully isolated from the moldy walnuts.
• Penitrem A was identified in extracts derived from the mycelium of the isolated Penicillium crustosum.
• The fungus demonstrated the ability to produce Penitrem A when cultured on a synthetic medium, confirming its role.

Implications:

• This study confirms Penicillium crustosum as a producer of Penitrem A in a natural setting.
• Highlights the risk of Penitrem A mycotoxicosis in animals from contaminated food sources like moldy walnuts.
• Underscores the importance of monitoring for mycotoxins in animal feed and food products to prevent intoxications.