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 Infectious Diseases and Conditions



Infectious diseases are the #1 cause of morbidity and mortality worldwide. Transmission of pathogen can occur in various ways including physical contact, contaminated food, body fluids, objects, airborne inhalation, or through vector organisms. Get the facts on infectious disease types, causes, prevention, and treatment, and learn how they spread.

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Noroviruses (genus Norovirus, family Caliciviridae) are a group of related, single-stranded RNA, non-enveloped viruses that cause acute gastroenteritis in humans. The most common symptoms of acute gastroenteritis are diarrhea, vomiting, and stomach pain. Norovirus is the official genus name for the group of viruses previously described as “Norwalk-like viruses” (NLV).

Noroviruses spread from person to person, through contaminated food or water, and by touching contaminated surfaces. Norovirus is recognized as the leading cause of foodborne-disease outbreaks in the United States. Outbreaks can happen to people of all ages and in a variety of settings. Read more about it using the following links:

--Key Facts
--Facts for Food Handlers
--Prevent the Spread of Norovirus
--Technical Fact Sheet
--Surveillance and Disease Burden
--Surveillance for Norovirus Outbreaks
--Prevention of Norovirus in Health Care Settings
(Healthcare-associated Infections web site)
--Norovirus in Health Care Facilities Fact Sheet

Additional Materials

--Updated Norovirus Outbreak Management and Disease Prevention Guidelines
--Facts about Noroviruses on Cruise Ships


Emerging Infectious Diseases
Infectious diseases are a continuing danger everyone. Some diseases have been effectively controlled with the help of modern technology. Yet new diseases—such as SARS and West Nile virus infection—are constantly appearing. Others, such as malaria, tuberculosis, and bacterial pneumonias, are now appearing in forms that are resistant to drug treatments. NCID offers a great deal of emerging infectious disease information.

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