What is the primary characteristic of a contagious viral disease such as Ebola?

The primary characteristic of a contagious viral disease like Ebola lies in its mode of transmission and the associated risks. Ebola is known for being transmitted through direct contact with the blood and body fluids of an infected person or through items that have come into contact with these fluids. This transmission route is a crucial aspect of the disease's spread, as it highlights the importance of handling infected individuals and their surroundings with extreme caution.

Additionally, Ebola has a notably high mortality rate, which is often linked to the severe symptoms that can arise, such as hemorrhaging and multi-organ failure. The dangers posed by this disease are compounded in healthcare settings where unprotected exposure to blood and bodily fluids can occur.

In contrast, the other options do not accurately characterize Ebola as a contagious viral disease. While severe dehydration can occur due to the symptoms of Ebola, it is not the primary characteristic. The virus does not primarily transmit through food, which eliminates that option. Lastly, while some symptoms may resemble those of respiratory illnesses in certain viral infections, Ebola is most distinctly associated with blood and fluid transmission rather than respiratory symptoms.