Infectious diarrhea is caused by a contagious virus or bacteria as opposed to a symptomatic response to parasites or spoiled food. Â Like any infection, these are spread by contact with contaminated food or water, pets or fecal matter transferred from diapers or toilets to surfaces that people touch. Â Washing hands thoroughly and frequently is the best prevention.
Children are often at greater risk when they use public restrooms and frequent environments with many other children. Â Travelers to third world countries are also at risk because of the differences in hygiene sometimes found there.
Viral contagion is typically self-limited and will eventually correct itself. Â Diarrhea caused by some bacteria will benefit from antibiotic treatment. Â The key to dealing with diarrhea is to stay hydrated.
Consult a physician for emergency care with a fever of 102° F or higher, severe abdominal pain with vomiting, or refusal to take fluids.  If there is blood in the mucus or stool, get emergency help.  In general, consult a doctor if signs of dehydration become apparent after 12 hours, such as dry mouth, lack of urine, lethargy or dizziness.
For more information on infectious diarrhea, see the following websites:
MedlinePlus on Bacterial Gastroenteritis
Children’s Hospital Guide to Infectious Diarrhea
American Academy of Family Physicians on the Management of Infectious Diarrhea: IDSA Guideline
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