Parapox ovis virus immunomodulator

**Parapox ovis virus immunomodulator** is a biologic immunostimulant primarily used in veterinary medicine to boost the non-specific immune response. Key characteristics include: * **Paramunity Inducer**: It utilizes an inactivated (killed) virus that originally causes 'orf' (contagious pustular dermatitis) in sheep. * **Equine Application**: In the US, it is labeled for healthy horses (4 months and older) to aid in reducing upper respiratory disease caused by **Equine Herpesvirus types 1 and 4 (EHV-1 and EHV-4)**. * **Reproductive Use**: Off-label, it is utilized in equine reproduction protocols for broodmares with delayed uterine clearance (DUC) or hyper-responsive uteri. * **Small Animal Use**: While not labeled in the US for small animals, similar products (e.g., Baypamun®) have been used in Europe for dogs and cats to stimulate non-specific immunity during viral infections or stress. > **Clinical Pearl**: Because the virus is inactivated, it cannot cause disease in the treated animal. It serves purely as a decoy to wake up the host's innate immune system.

กลไกการออกฤทธิ์: The drug acts as a **paramunity inducer** through a process known as **viral interference**. * **Mechanism**: The inactivated parapoxvirus "infects" host cells with a defective, non-replicating viral particle. * **Immune Activation**: This pseudo-infection $\rightarrow$ triggers the host's innate immune system $\rightarrow$ leading to the induction and release of **interferons**, **cytokines**, and **colony-stimulating factors**. * **Cellular Response**: It also stimulates the activation of **natural killer (NK) cells**, which help clear pathogenic viruses before they can establish a robust infection.

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