Enteroviruses reproduce in the gastrointestinal tract after an infection but don't lead to intestinal symptoms; they causes disease by spreading to organs such as the nervous system, heart, and skin. There are four groups of enteroviruses: Coxsackievirus, Echovirus, ungrouped Enterovirus, and Polio virus; the first three are covered here. Enteroviruses are found worldwide, but are more common in areas of poor hygiene and overcrowding. Although most cases do not produce symptoms, 5-10 million people in the United States each year suffer from an enteroviral disease. Illness is more common in the very young, including fetuses. The virus is usually transmitted by fingers or objects contaminated by human waste material; it can also be transmitted through contaminated food or water. The incubation period for most enteroviruses ranges from 2-14 days. Enteroviruses are believed to be the cause of at least 10 illnesses. Once they enter the body, they...