In relation to abortion risk in horses, which virus is associated with abortions?

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Multiple Choice

In relation to abortion risk in horses, which virus is associated with abortions?

Explanation:
Abortion risk in horses is most strongly linked to infection with Equine herpesvirus 1. This herpesvirus can reactivate in pregnant mares and travel across the placenta, causing placental vasculitis and placental separation that lead to fetal death, especially in late gestation. Transmission occurs through respiratory secretions, and stressed or immunocompromised mares are more likely to shed virus and experience abortion storms. Vaccination of broodmares and good biosecurity help reduce this risk, though they don’t guarantee complete protection. In contrast, equine influenza primarily causes respiratory signs like fever and coughing; African horse sickness and Hendra virus can cause severe systemic disease but abortion is not the hallmark outcome associated with them.

Abortion risk in horses is most strongly linked to infection with Equine herpesvirus 1. This herpesvirus can reactivate in pregnant mares and travel across the placenta, causing placental vasculitis and placental separation that lead to fetal death, especially in late gestation. Transmission occurs through respiratory secretions, and stressed or immunocompromised mares are more likely to shed virus and experience abortion storms. Vaccination of broodmares and good biosecurity help reduce this risk, though they don’t guarantee complete protection. In contrast, equine influenza primarily causes respiratory signs like fever and coughing; African horse sickness and Hendra virus can cause severe systemic disease but abortion is not the hallmark outcome associated with them.

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