Norwalk virus

Introduction: Norwalk virus

Description of Norwalk virus

Norwalk virus (medical condition): Several shellfish or oyster-associated gastro-causing viruses related to Norwalk or caliciviruses. See also Norwalk-like viruses:
  »Introduction: Norwalk-like viruses
  »Symptoms of Norwalk-like viruses

Norwalk virus: a virus associated with acute viral gastroenteritis and belonging to the calicivirus group.
Source: Stedman's Medical Spellchecker, © 2006 Lippincott Williams & Wilkins. All rights reserved.

Norwalk virus: type species in the genus Norovirus; the virions are non-enveloped spherical particles containing a single protein; multiple strains are named after the places where outbreaks have occurred.
Source: Diseases Database

Norwalk virus: type species in the genus Norovirus; the virions are non-enveloped spherical particles containing a single protein; multiple strains are named after the places where outbreaks have occurred.
Source: CRISP

Norwalk virus: The type species in the genus NOROVIRUS, first isolated in 1968 from the stools of school children in Norwalk, Ohio, who were suffering from GASTROENTERITIS. The virions are non-enveloped spherical particles containing a single protein. Multiple strains are named after the places where outbreaks have occurred.
Source: MeSH 2007

Norwalk virus as a Disease

Norwalk virus: Another name for Norwalk-like viruses (or close medical condition association).
  »Introduction: Norwalk-like viruses
  »Symptoms of Norwalk-like viruses

Norwalk virus: Norwalk virus is listed as a type of (or associated with) the following medical conditions in our database: Viral gastroenteritis, Food poisoning

Symptoms of Norwalk virus (Norwalk-like viruses)

Some of the symptoms of Norwalk virus incude:

• Nausea
• Vomiting
• Diarrhea
• Abdominal cramps
• Headache

See full list of 6 symptoms of Norwalk virus (Norwalk-like viruses)

Norwalk virus: Article Excerpts about Norwalk-like viruses

FDA Bad Bug Book (Excerpt)

Common names of the illness caused by the Norwalk and Norwalk-like viruses are viral gastroenteritis, acute nonbacterial gastroenteritis, food poisoning, and food infection.

Norwalk virus is the prototype of a family of unclassified small round structured viruses (SRSVs) which may be related to the caliciviruses. They contain a positive strand RNA genome of 7.5 kb and a single structural protein of about 60 kDa. The 27-32 nm viral particles have a buoyant density of 1.39-1.40 g/ml in CsCl. The family consists of several serologically distinct groups of viruses that have been named after the places where the outbreaks occurred. In the U.S., the Norwalk and Montgomery County agents are serologically related but distinct from the Hawaii and Snow Mountain agents. The Taunton, Moorcroft, Barnett, and Amulree agents were identified in the U.K., and the Sapporo and Otofuke agents in Japan. Their serological relationships remain to be determined. (Source: FDA Bad Bug Book)

FDA Bad Bug Book (Excerpt)

Caliciviruses are classified in the family Caliciviridae. They contain a single strand of RNA surrounded by a protein capsid of 31-40 nm diameter. Mature virions have cup-shaped indentations which give them a 'Star of David' appearance in the electron microscope. The particle contain a single major coat protein of 60 kDa and have a buoyant density in CsCl of 1.36 - 1.39 g/ml. Four serotypes have been identified in England. (Source: FDA Bad Bug Book)

Foodborne Infections General: DBMD (Excerpt)

Calicivirus, or Norwalk-like virus is an extremely common cause of foodborne illness, though it is rarely diagnosed, because the laboratory test is not widely available.  It causes an acute gastrointestinal illness, usually with more vomiting than diarrhea, that resolves within two days. (Source: excerpt from Foodborne Infections General: DBMD)

Facts About Norwalk-like Viruses: CDC-OC (Excerpt)

Norwalk viruses (and related caliciviruses) are important causes of sporadic and epidemic gastrointestinal disease in the United States. An estimated 181,000 cases occur annually. (Source: excerpt from Facts About Norwalk-like Viruses: CDC-OC)

Terms associated with Norwalk virus:

Broader terms for Norwalk virus

• Norovirus

Source - MeSH 2007

• Calicivirus

Source - CRISP

The term Norwalk virus can be used for:

• Norwalk agent
• Norwalk gastroenteritis

Source: CRISP

Other terms that may be related to Norwalk virus:

• acute infectious nonbacterial gastroenteritis
• emerging infectious disease

Source: CRISP

Hierarchical classifications of Norwalk virus

The following list attempts to classify Norwalk virus into categories where each line is subset of the next.

MeSH 2007 Hierarchy:

• Viruses
  • RNA Viruses
    • Caliciviridae
      • Norovirus
        • Norwalk virus

MeSH 2007 Hierarchy

• Viruses
  • Vertebrate Viruses
    • RNA Viruses
      • Caliciviridae
        • Norovirus
          • Norwalk virus

External links related to: Norwalk virus

• Norwalk virus - Material Safety Data Sheets (MSDS)
• eMedicine - Norwalk Virus : Article by Michelle A Jaworski, MD
• US FDA/CFSAN - Bad Bug Book - The Norwalk virus family
• US FDA/CFSAN - Bad Bug Book - The Norwalk virus family

Source: Diseases Database

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