One of the biggest debates raging about equine herpesvirus meyloencephalopathy (EHM, the neurologic form of EHV-1) is whether there is a single mutant strain that is in circulation that causes EHM; whether the wild strain can “convert” to the mutant neurologic strain; whether the wild strain can cause EHM without converting to the mutant strain; and whether any other strains of herpesviruses can cause neurologic problems in horses.

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