Related Experiment Video

Updated: Aug 15, 2026

Particle Agglutination Method for Poliovirus Identification
07:06

Particle Agglutination Method for Poliovirus Identification

Published on: April 20, 2011

Paralytic vs. "nonparalytic" polio: distinction without a difference?

R L Bruno1

  • 1The Post-Polio Institute, Englewood Hospital and Medical Center, New Jersey, USA.

American Journal of Physical Medicine & Rehabilitation
|March 4, 2000
PubMed

Insights

Nonparalytic polio (NPP) can cause central nervous system damage and lead to long-term weakness. Clinicians should consider NPP as a potential cause of postpolio syndrome symptoms.

Area of Science:

  • Neurology
  • Infectious Diseases
  • Epidemiology

Background:

  • Nonparalytic polio (NPP) is often misperceived as a mild illness without neurological impact.
  • Historically, conditions like "The Summer Grippe" and "Iceland disease" were linked to poliovirus.
  • Previous understanding excluded central nervous system involvement in NPP.

Purpose of the Study:

  • To re-evaluate the neurological consequences of nonparalytic polio.
  • To investigate the link between NPP and late-onset neurological symptoms.
  • To inform diagnostic criteria for postpolio syndrome.

Main Methods:

  • Review of historical epidemic data (e.g., "The Summer Grippe," "Iceland disease").
  • Analysis of studies documenting neuropathology in NPP cases.
  • Examination of epidemiological data on long-term outcomes in NPP survivors.

Main Results:

  • Evidence suggests NPP, caused by neuropathic type 2 poliovirus, involves neuronal lesions in the brain and spinal cord.
  • Muscle weakness was a common finding in NPP.
  • 14% to 42% of NPP survivors reported late-onset weakness and fatigue.

Conclusions:

  • NPP can cause acute central nervous system damage, contrary to previous beliefs.
  • Late-onset muscle weakness and fatigue are significant sequelae of NPP.
  • Diagnostic criteria for postpolio syndrome should be broadened to include NPP and potentially milder poliovirus illnesses.

More Related Videos

Assessing Forelimb Function after Unilateral Cervical SCI using Novel Tasks: Limb Step-alternation, Postural Instability and Pasta Handling08:11

Assessing Forelimb Function after Unilateral Cervical SCI using Novel Tasks: Limb Step-alternation, Postural Instability and Pasta Handling

Published on: September 16, 2013

Whole Body Vibration Methods with Survivors of Polio04:16

Whole Body Vibration Methods with Survivors of Polio

Published on: October 17, 2018

Related Concept Videos

Classification of Skeletal Muscle Relaxants01:28

Classification of Skeletal Muscle Relaxants

Skeletal muscle relaxants are a group of drugs that can reduce muscle stiffness and induce temporary paralysis to relieve pain. These agents can act centrally to reduce muscle tone or spasms in painful conditions such as multiple sclerosis (MS), amyotrophic lateral sclerosis (ALS), or spinal injuries; they are called antispasmodics or spasmolytics.
Peripherally acting skeletal muscle relaxants interfere with the neurotransmission at the neuromuscular end plate to induce paralysis during...
Tetanus01:29

Tetanus

Tetanus is a life-threatening neurological disorder characterized by persistent muscle contractions and spastic paralysis. It is caused by Clostridium tetani, a motile, Gram-positive, rod-shaped, obligate anaerobe. These bacteria produce terminal endospores, giving them a distinctive “lollipop” or “tennis-racket” appearance. They thrive in anaerobic environments, such as those found in deep puncture wounds.Once introduced into the body, the spores germinate into vegetative cells. These cells...
Botulism01:22

Botulism

Botulism is a life-threatening neuroparalytic condition caused by botulinum neurotoxin, which is produced by the bacterium Clostridium botulinum, a Gram-positive, spore-forming, obligate anaerobe.In adults, the toxin enters the body in different ways: in foodborne botulism, the preformed toxin is absorbed in the intestine. In wound botulism, spores grow in injured tissue and release the toxin into the blood. Infant botulism differs mechanistically from adult forms. In infants, botulism commonly...
Poliomyelitis01:17

Poliomyelitis

Poliomyelitis is caused by poliovirus, a small, non-enveloped, positive-sense RNA virus of the Picornaviridae family and Enterovirus genus. Transmission occurs primarily via the fecal-oral route, often through ingestion of contaminated water or food. The virus initially replicates in the oropharynx and intestinal mucosa, particularly in lymphoid tissues such as the tonsils, Peyer’s patches, and regional lymph nodes. Primary viremia follows, allowing dissemination throughout the body.In most...
Alterations in Muscle Tone ll01:12

Alterations in Muscle Tone ll

Alterations in muscle tone are common manifestations of neurological disorders and reflect dysfunction within different nervous system regions. Spasticity, paratonia, and dystonia represent distinct forms of hypertonia, each with unique mechanisms, clinical features, and diagnostic importance.CharacteristicsSpasticity happens from upper motor neuron lesions and is characterized by velocity-dependent resistance to passive movement. Clinical features include:Exaggerated deep tendon reflexesClonus...
Alterations in Muscle Tone lll01:11

Alterations in Muscle Tone lll

Rigidity and myotonia are distinct abnormalities of muscle tone that affect resistance and relaxation during movement. Although both involve altered muscle contraction, they arise from different neurological and muscular mechanisms.CharacteristicsRigidity is characterized by uniform resistance to passive movement across the entire range, independent of speed, affecting flexors and extensors equally. It may appear as lead-pipe rigidity (smooth, constant resistance) or cogwheel rigidity...