Polio, or poliomyelitis, is a highly contagious viral infection that can lead to paralysis, breathing problems, or even death. The term poliomyelitis is from the Greek polios poliÃ³s meaning, grey myelos myelÃ³s referencing the, spinal-cord and itis. Meaning inflammation polio can be classified as either symptomatic. or asymptomatic
1 Prions are proteins that can force conformational changes in natural proteins and seem to cause disease (kuru, new variant Creutzfeldt-Jakob disease, and fatal familial insomnia).  A virus is an obligate intracellular pathogen (meaning that it must live within the cells of its host in order to reproduce).
An obligate parasite is a parasite that must be with its host, or it dies. Obligate parasites depend on the presence of a host to complete their life cycle. Obligate parasites are common.There are parasitic plants, fungi, bacteria, and animals. The inverse of an obligate parasite is a facultative parasite, a parasite that can complete its life cycle independent of a host.One of the most standard obligate parasites are viruses.here are parasitic plants, fungi, bacteria, and animals. The inverse of an obligate parasite is a facultative parasite, a parasite that can complete its life cycle independent of a host.