Norwalk Virus

Norwalk virus infection is caused by the Norwalk virus. Norwalk and Norwalk-like viruses are found worldwide. Humans are the only known hosts. The viruses are passed in the stool of infected persons.

The virus was first identified in 1972 after an outbreak of gastrointestinal illness in Norwalk, Ohio. Later, other viruses with similar features were described and called Norwalk-like viruses. These have since been classified as members of the calicivirus family.  Norwalk and Norwalk-like viruses are found worldwide. Humans are the only known hosts. The viruses are passed in the stool of infected persons.

What are the signs and symptoms of Norwalk virus infection?

• Nausea
• Vomiting
• Diarrhea
• Stomach cramps
• Severe illness or hospitalization is uncommon.
• Infected persons usually recover in 2 to 3 days without serious or long-term health effects.