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Data S1. Case definitions used in USDA–APHIS–VS recommendations for exposed horses to EHV-1 or EHM.

Table S1. List of the number of primary exposed horses, number of PEH cases (EHV-1 or EHM suspect or confirmed cases eligible for inclusion in study), number of eligible controls, and number of selected controls by state.

Table S2. Characteristics of horses, housing, health management, and travel reported by owner/trainer survey respondents for the three comparison groups and for all horses.

Table S3. Univariable odds ratios (OR) and 95% confidence intervals (CI) for EHM risk factors comparing EHM cases (n = 19) with EHV-1 cases with no reported neurological signs (n = 14).

Table S4. Univariable odds ratios (OR) and 95% confidence intervals (CI) for EHM risk factors and covariates comparing EHM cases (n = 19) with controls (n = 90).

Data S2. Case and Control Horse questionnaire.

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