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By Mayo Clinic staffGastroenteritis occurs all over the world, affecting people of every age, race and background. In developing nations, it's a leading cause of death in children.
Children in child care centers and older adults living in nursing homes are especially vulnerable. That's because children's immune systems aren't mature until about age 6, and adult immune systems tend to become less efficient later in life.
Intestinal infections can flourish anywhere people congregate — from schools and dormitories to campgrounds and luxury cruise ships. Adults whose resistance is low — often because their immune systems are compromised by HIV, AIDS or other medical conditions — are especially at risk.
Each gastrointestinal virus has a season when it's most active. If you live in the Northern Hemisphere, you're more likely to get rotavirus or the Norwalk virus between October and April.
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