Fever, muscle aches, nausea or diarrhea are the most common symptoms, but the infection can spread to the nervous system, causing headaches, a stiff neck and convulsions. About 2,500 people become seriously ill in the United States each year from listeria and about 500 die.
Confidence votes 40.5K. The symptoms are your body's way of reacting to a disease. It is often said that pathogens are the same as germs and cause only infectious disease, however, the word can mean the agent that causes any type of disease.iseases caused by pathogens are often contagious and include things such as Meningitis, Influenza and Tuberculosis. Diseases not caused by pathogens are generally things wh â¦ ich go wrong in the body. For example, Cancer, Multiple Sclerosis and Motor Neurone Disease are all diseases not caused by pathogens.
Primary bacterial diseases are caused by invasion of bacteria that cause disease with no other predisposing factors. Secondary bacterial diseases are caused by invasion of bacteria after a predisposing condition, such as viral infections, stresses, tissue injuries, and dietary upsets.A bacterial disease may affect a single tissue or organ, or it may affect multiple tissues and organs of the animal.iruses often infect specific types of cells causing damage to the tissues or organs that those cells make up. Similar to bacte-rial disease, viruses can be found in the bloodstream, which is called viremia. Viruses are causative agents of many types of animal diseases.