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).
Viruses are obligate intracellular parasites, which means they have to live inside of a host and steal hosts enzymes to allow replication, like when aliens inhabit the bodies of politicians and run for officeâ¦ it happens.hat being said, some viruses, including influenza, enter and replicate in the nucleus because they require splicing enzymes for replication. Virus replication usually occurs in two stages: early and late. These two stages are defined by the types of viral proteins made in each stage.