Equine leucoencephalomalacia (ELEM): a study of Fusarium moniliforme as an etiologic agent.

This research explores the role of Fusarium moniliforme, a fungal pathogen, in the development of a neurological disease in horses called Equine Leucoencephalomalacia. The study involved feeding corn infected with the fungus to animals and observing the resultant effects. Only one of two donkeys developed symptoms of the disease, while other animals did not.

Experiment Setup

• The study used two donkeys and three rabbits as test subjects, all of which were given corn cultured with Fusarium moniliforme Sheldon, a fungus species known to be pathogenic in certain circumstances.
• The corn used as feed was deliberately infected with the fungus to examine its potential role in the onset of Leucoencephalomalacia, a brain disease specific to horses.
• The experimental setup aimed to identify whether the fungus could induce the characteristic symptoms and structural damage associated with the disease.

Observations and Results

• After feeding on the cultured corn, only one donkey exhibited the characteristic signs and lesions of equine leucoencephalomalacia.
• The symptoms included prominent perivascular hemorrhage (bleeding around the blood vessels), disruption and rarefication of the subcortical white matter (damage and thinning of the brain tissue beneath the cortex), extensive necrotic cavitation in one cerebral hemisphere (large areas of dead brain tissue), and some mononuclear cell perivascular cuffing (an inflammatory response around the blood vessels).
• The second donkey and all three rabbits did not develop any signs or lesions indicative of the toxicosis (poisoning caused by the fungus).

Biochemical Analysis

• Chick bioassay studies were conducted on the fungus-infected corn that was used in the experiment.
• These tests revealed that the corn did not contain a monovalent salt of moniliformin, a specific fungal toxin often produced by Fusarium species.
• This suggests that other factors, possibly unknown metabolites or physiological responses, may be responsible for the disease symptoms in the affected donkey.

Implications and Conclusion

• While only one donkey developed the disease symptoms after eating the fungus-infected corn, the observation was significant as it aligns with the characteristics of equine leucoencephalomalacia.
• Fusarium moniliforme appears to hold the potential to induce the disease, but its role as an etiologic agent cannot be confirmed without further research. Likewise, the presence or absence of moniliformin does not definitively prove or disprove its role in disease onset.
• This research provides vital initial insights into a possible link between the fungus Fusarium moniliforme and equine leucoencephalomalacia but further analysis and more extensive studies are needed to confirm this relationship.