http://uimc.discoveryhospital.com/main.php?id=3094 "Vomiting itself is not contagious and poses no risk to others. However, if the cause is an infection, the infection may be contagious." - University of Illinois Medical Center, Link above quote http://www.etown.edu/HealthServices.aspx?topic=SCNauseaAndVomiting "While nausea and vomiting themselves are not contagious, the things that cause them may be very contagious. " - Elizabethtown College Service, Link above quote The most common reason for vomiting is viral gasroenteritis. That can be contagious for more than 2 weeks after symptoms end. Without diarrhea though it sounds like VG isn't the likely cause. From what I've read it looks like vomiting by itself is likely a more mild virus and isn't contagious after 24-48 hours. This isn't verified though. http://digestive.niddk.nih.gov/ddiseases/pubs/viralgastroenteritis/ "Viral gastroenteritis is highly contagious. The viruses are commonly transmitted by people with unwashed hands. People can get the viruses through close contact with infected individuals by sharing their food, drink, or eating utensils, or by eating food or drinking beverages that are contaminated with the virus. Noroviruses in particular, are typically spread to other people by contact with stool or vomit of infected people and through contaminated water or food-especially oysters from contaminated waters. People who no longer have symptoms may still be contagious, since the virus can be found in their stool for up to 2 weeks after they recover from their illness. Also, people can become infected without having symptoms and they can still spread the infection. Outbreaks of viral gastroenteritis can occur in households, child care settings, schools, nursing homes, cruise ships, camps, dormitories, restaurants, and other places where people gather in groups. If you suspect that you were exposed to a virus in one of these settings or by foods prepared on the premise of places such as a restaurant, deli, or bakery, you may want to contact your local health department, which tracks outbreaks." - National Digestive Diseases Clearinghouse, Link above quote
May not seem obvious, but Diarrhea and Vomiting are symptoms of foodborne illness, which is contagious. Plus, Diarrhea and Vomiting in themselves are contagious. They just want to prevent further spread of the illness.
samonella or e.coli
its not contagious, however what ever causes it might be Diarrhea is a symptom of an ailment or disease. It in itself is not contagious but the disease causing it may be contagious.
How long is the 24 stomach flu contagious for
e coli
HPV is not contagious as long as your immune system supresses it. If it is dormant, your immune system is properly controlling it and it isn't contagious.
it takes 3 or 4 days to not be contagious
Urinary tract infections are not contagious.
once treatment is started are ear mites still contagious
it is 100 years
I am pretty sure that you are contagious for 24 hours after your first dose.
Vomiting clears the dige stive system, so if the child has been vomiting for more than 12 hours (max), then get him/her to a hospital asap.