<P> Children infected with rotavirus usually make a full recovery within three to eight days . However, in poor countries treatment for severe infections is often out of reach and persistent diarrhea is common . Dehydration is a common complication of diarrhea, and a child with a significant degree of dehydration may have a prolonged capillary refill, poor skin turgor, and abnormal breathing . Repeat infections are typically seen in areas with poor sanitation, and malnutrition, stunted growth, and long - term cognitive delays can result . </P> <P> Reactive arthritis occurs in 1% of people following infections with Campylobacter species, and Guillain--Barré syndrome occurs in 0.1% . Hemolytic uremic syndrome (HUS) may occur due to infection with Shiga toxin - producing Escherichia coli or Shigella species, causing low platelet counts, poor kidney function, and low red blood cell count (due to their breakdown). Children are more predisposed to getting HUS than adults . Some viral infections may produce benign infantile seizures . </P> <P> Viruses (particularly rotavirus) and the bacteria Escherichia coli and Campylobacter species are the primary causes of gastroenteritis . There are, however, many other infectious agents that can cause this syndrome . Non-infectious causes are seen on occasion, but they are less likely than a viral or bacterial cause . Risk of infection is higher in children due to their lack of immunity and relatively poor hygiene . </P> <P> Rotavirus, norovirus, adenovirus, and astrovirus are known to cause viral gastroenteritis . Rotavirus is the most common cause of gastroenteritis in children, and produces similar rates in both the developed and developing world . Viruses cause about 70% of episodes of infectious diarrhea in the pediatric age group . Rotavirus is a less common cause in adults due to acquired immunity . Norovirus is the cause in about 18% of all cases . </P>

Travelers diarrhea a common syndrome of gastroenteritis is usually caused by