Question

Foot and mouth disease of cattle is caused by a
A. Virus
B. Bacteria
C. Fungi
D. Protozoa

Answer 1

Susceptible animals that suffer from foot and mouth disease include cattle, water buffalo, sheep, goats, pigs, antelope, deer, and bison. It has also been known to infect hedgehogs and elephants; llamas and alpacas may develop mild symptoms, but are resistant to the disease and do not pass it on to others of the same species.

Complete step by step answer: Foot-and-mouth disease (FMD) or hoof-and-mouth disease (HMD) is an infectious and sometimes a fatal viral disease that affects cloven-hoofed animals, including domestic and wild bovids. The virus causes a high fever lasting two to six days, followed by blisters inside the mouth and on the feet, that may rupture and cause lameness. The virus responsible for FMD is an aphthovirus, foot-and-mouth disease virus. Infection occurs when the virus particle is taken into a cell of the host. The cell is then forced to manufacture thousands of copies of the virus, and eventually bursts,
releasing the new particles in the blood. The virus is genetically highly variable, which limits the effectiveness of vaccination. The FMD virus can be transmitted in a number of ways, including close-contact, animal-to-animal spread, long-distance aerosol spread, and fomites, or inanimate objects, typically fodder and motor vehicles. The clothes and skin of animal handlers such as farmers, standing water, and uncooked food scraps and feed supplements containing infected animal products can harbor the virus, as well.
So, the answer is A, i.e., Virus

Note: Vaccination, strict monitoring, trade restrictions, quarantines, and the culling of both infected and healthy (uninfected) animals can help to get rid of this disease. Cows can also catch FMD from the semen of infected bulls