Old Disease is a term that refers to any disease that has been around for a long period of time. One example of an old disease is POLIO, which is a highly infectious viral disease that can cause paralysis and even death. POLIO is spread through contact with an infected person's saliva or feces, and it can be prevented through vaccination. POLIO was once a major public health concern in the United States, but due to widespread vaccination efforts, it has been nearly eliminated in the country.