Porcine Vesicular Diseases Study Guide

Overview and Clinical Importance

Vesicular diseases represent a critical category of swine diseases characterized by the formation of fluid-filled blisters (vesicles) on the snout, oral cavity, coronary bands, and interdigital spaces. These diseases are of paramount importance because they are clinically indistinguishable from one another and require mandatory laboratory confirmation to differentiate them from Foot-and-Mouth Disease (FMD), a Foreign Animal Disease (FAD) that would have catastrophic economic consequences if introduced into FMD-free countries.

The five vesicular diseases affecting swine include: Foot-and-Mouth Disease (FMD), Swine Vesicular Disease (SVD), Vesicular Stomatitis (VS), Vesicular Exanthema of Swine (VES), and Senecavirus A (SVA). Understanding the differential diagnosis of these conditions is essential for the NAVLE examination.

Comparison of Vesicular Diseases in Swine

Foot-and-Mouth Disease (FMD)

Foot-and-Mouth Disease is the most economically devastating vesicular disease and the primary concern when any vesicular lesions are identified in swine. FMD is caused by an Aphthovirus of the family Picornaviridae with 7 serotypes (O, A, C, SAT1, SAT2, SAT3, and Asia1). Type O is the most prevalent worldwide. Importantly, vaccination against one serotype does NOT provide cross-protection against other serotypes.