Poliomyelitis - Paralysis Causes & Treatments

Wednesday, August 3, 2022

Poliomyelitis

 





Poliomyelitis

Polioviruse, that targeting motor neurons

Poliomyelitis is caused by three serotypes of poliovirus, a neurotropic RNA virus of the family Picornaviridae, genus Enterovirus.

Poliovirus type 1 has the highest ratio of paralytic infection to subclinical infection and is the most frequent cause of epidemics of paralytic disease. Poliovirus types 2 and 3 are less neurovirulent. Type 2 wild poliovirus was the first serotype to be eradicated in the Americas; as of 1999, the only remaining foci of type 2 wild poliovirus transmission were detected in northern India . Type 3 wild poliovirus caused a major outbreak of paralytic disease in Angola in 1999 .

Poliomyelitis is transmitted by person-to-person spread through facial-oral and oral-oral routes, or occasionally by a common vehicle (e.g., water, milk). The incubation period is typically 7-14 days (range, 3-35 days). When nonimmune persons are exposed to wild poliovirus, inapparent infection is the most frequent outcome.