Which statement about swine vesicular disease is true regarding host range?

• A. Pigs are the only species naturally infected
• B. Multiple species are equally affected
• C. No pigs are affected
• D. Humans are the primary reservoirs

Answer: (A)

The question is about the natural host range of swine vesicular disease. In real-world outbreaks, the infection is confined to pigs; domestic pigs and, in some regions, wild boar, are the species affected. There are no well-established natural infections in other species, and humans are not a reservoir that maintains transmission to pigs. Therefore, the statement that pigs are the only species naturally infected best matches the observed host range. The other options imply broader natural susceptibility or a reservoir role for humans, which isn’t supported by the disease’s epidemiology.