- About.com: Norwalk Viruses on Cruise Ships - Why Do People Get a Norwalk Virus at Sea?
 - Explains what is the norwalk virus and how one can lessen the chances of getting it. - CDC: Norovirus
- Information about the viral group that causes acute gastroenteritis in humans, with basic and technical information, norovirus issues in food preparation, and norovirus infections in health care facilities. From the U.S. Centres for Disease Control and Prevention.
- eMedTV: Norovirus
- About the norovirus that can cause acute viral gastroenteritis commonly known as the stomach flu. Includes its transmission, incubation period, diagnosis, treatment, prognosis, and prevention.
- Food Safety and Sanitation Program: Norovirus
- Describes the group of viruses that cause gastrointestinal illness with an emphasis on preventing the spread of Norovirus in food preparation environments.
- MayoClinic: Norovirus Infection
- Overview including diagnosis, treatment, and prevention of this highly infectious disease characterized by diarrhea, abdominal pain, and vomiting.
- MedicineNet: Norovirus Infection
- Detailed overview of norovirus infections featuring its symptoms, diagnosis, treatment, and prevention.
- National Park Service Public Health Program: Norovirus Factsheet
- Features the Norwalk-like viruses which cause gastroenteritis or stomach flu.
- Norovirus (Norwalk-like Virus, Small Round Structured Virus/SRSV)
- Basic information about Norovirus and Norovirus gastroenteritis from the U.K. Health Protection Agency.
- Norovirus Infection
- About the foodborne intestinal illness frequently found both on cruise ships and in communities, restaurants, camps, and schools. From the Rhode Island Department of Health Office of Communicable Diseases.
- Norovirus Q&A
- Information about the group of viruses that cause "stomach flu," or gastroenteritis, in people. Includes symptoms of illness caused by Norovirus infection, how it spreads, and prevention tips.
- NZFSA: Norovirus
- FAQs about the noroviruses which can cause severe stomach upsets including gastroenteritis through contaminated food.
- WebMD: Noroviruses
- Overview of the noroviruses and their infections such as stomach flu and acute non-bacterial gastroenteritis. Includes causes, symptoms, diagnosis, and treatment.
- WebMD: Sailing Into Sickness?
- Includes information about Norovirus outbreaks on cruise ships.
- Wikipedia: Norovirus
- User-edited article about the virus that causes non-bacterial gastroenteritis infection. Includes signs and symptoms, diagnosis, prevention, and complications.
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