2/8/2024 0 Comments Wild doseParalytic polio is classified into three types, depending on the level of involvement. Weakness or paralysis present 12 months after onset, which occurs in two-thirds of patients with paralysis, is usually permanent. Paralysis is often permanent, although total or partial recovery can occur through compensation by muscles not affected. Patients usually do not experience changes in cognition. Paralysis is typically asymmetrical, more severe proximally, and associated with absent or reduced deep tendon reflexes and intact sensation. Among adolescents and adults, the minor illness is often absent and they suffer more severe pain and paralysis. Paralysis usually progresses within 2 to 3 days. The course may be biphasic in children, with initial minor illness that lasts several days, a symptom-free period of 1 to 3 days, followed by the major illness with paralysis, fever and muscle pain. Less than 1% of all polio infections in children result in flaccid paralysis. ![]() Typically, symptoms last 2 to 10 days and are followed by complete recovery. Increased or abnormal sensations (e.g., pain in the limbs, back, or neck), headache, and vomiting can also occur. The clinical presentation includes stiffness of the neck, back, or legs, usually following several days of a prodrome similar to that of minor illness. Nonparalytic aseptic meningitis occurs in 1% to 5% of polio infections in children. ![]() This clinical presentation is known as abortive poliomyelitis, and is characterized by a low fever, sore throat, and complete recovery in less than a week. Infected individuals without symptoms shed the virus in nasopharyngeal secretions and stool for several days or weeks and are able to transmit the virus to others.Īpproximately 24% of polio infections in children consist of a minor, nonspecific illness without clinical or laboratory evidence of central nervous system invasion. The risk of severe disease and death following primary infection with poliovirus increases with increasing age.Īpproximately 70% of all polio infections in children are asymptomatic. For the onset of paralysis in paralytic poliomyelitis, the incubation period is usually 7 to 21 days. The incubation period for nonparalytic poliomyelitis is 3 to 6 days.
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