Foot-and-Mouth disease in animals, a current epidemic in some parts of the world, is caused by

Foot-and-mouth disease (FMD) in animals is caused by the foot-and-mouth disease virus (FMDV), not by bacteria, fungi, or protozoa. Textbook listings explicitly name FMDV as the causal organism for FMD in susceptible livestock and wild cloven-hoofed animals [1]. International veterinary authorities classify the agent as an Aphthovirus in the family Picornaviridae, with multiple serotypes and high antigenic variability [2]. Clinical and reference manuals further describe FMDV as a small, non-enveloped, positive-sense single-stranded RNA virus responsible for highly contagious disease in cattle, swine, sheep, goats and other cloven-hoofed species, confirming its viral etiology.

Sources

1. [1] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 12: Animal Diversity of India > 12,7. W ILDLIF E DISEASES > p. 193
2. [2] https://www.woah.org/app/uploads/2021/09/foot-and-mouth-disease-1.pdf