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Viral gastroenteritis, also known as stomach flu, is an inflammation of the mucous coating of the stomach and intestines caused by certain groups of viruses. They settled in the epithelial cells of the mucosa, where they multiply and cause damage to the normal structure and function. The stomach flu is a highly infectious and very common - every year there are tens of millions. Rotavirus. Rotaviruses are the leading cause of stomach flu in infants and young children. Incubation was continued for 1 to 3 days. Usually, the infection is accompanied by watery diarrhea, vomiting, fever and muscular pain for 3 to 7 days. Rotaviruses can infect and adults in contact with the ailing child. In adults, the stomach flu symptoms less severe. Calicivirus. Cause infections in people of all ages. Noroviruses are the most common calicivirus and the most common cause of stomach flu in adults. Often reaching epidemic. Usually epidemics broke out from October to April, but are possible at any time of year. Typical stomach flu symptoms include nausea, vomiting, abdominal pain, fatigue, headache and muscle aches. The symptoms started 1-2 days after contact with the virus and still 1 to 3 days. Adenoviruses. Mainly infects children under 2 years. There are 49 types of adenoviruses, one of which affects the gastrointestinal tract and causes nausea and diarrhea. The incubation period is 8-10 days and symptoms persist between one and two weeks. Adenoviral infections may occur at any time of year. Astroviruses. Infect mostly infants and children less adults. The symptoms are watery diarrhea and vomiting, continuing for up to one week, and appears after an incubation period of 3-4 days. Symptoms were less severe than Norovirus or rotavirus infections. Astroviruses stomach flu are most common during the winter months.

The stomach flu is an inflammation of the stomach and intestines, which can be caused by various reasons. The main symptom of the disease is diarrhea, but it may be accompanied by nausea, vomiting and abdominal pain.

In adults stomach flu is caused most often by Norovirus, about 50% to 70% of cases. The new norovirus "Sydney 2012" is not associated with worse symptoms than other strains noroviruses. In the U.S., the Centre for Control and Prevention of Diseases show that Noroviruses cause 21 million illnesses annually. Of these, 70,000 cases require hospitalization and approximately 800 are fatal.

Influenza, commonly shortened to "flu" is an extremely contagious respiratory illness caused by influenza A or B viruses. Flu appears most frequently in winter and early spring.