• A species of non-enveloped and spherical viruses with a capsid with T=3 icosahedral symmetry in the Caliciviridae family and Norovirus genus. The genome is composed of single-stranded, positive-sense RNA. Norwalk viruses are found in humans and causes acute viral gastroenteritis. Norwalk viruses are transmitted via oral ingestion or fecal-oral contamination.
  NCI
  U.S. National Cancer Institute, 2021
• Any viral organism that can be assigned to the species Norwalk virus.
  CDISC Terminology
  Clinical Data Interchange Standards Consortium (CDISC), 2021
• 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.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2025
• 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.
  CRISP Thesaurus
  National Institutes of Health, 2006
• Norovirus, formerly referred to as Norwalk virus, is the most common cause of epidemic nonbacterial gastroenteritis in the world. The image below depicts the norovirus genomic structure and capsid domains.
  Medscape
  WebMD, 2025