- 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. - 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.
- Fact Sheet on 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.
- 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
- General factsheet about 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 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.
- U.S. 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.
- 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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