United States. AGE DISTRIBUTION. When drawn as a population pyramid, age distribution can hint at patterns of growth. A top heavy pyramid, like the one for Grant County, North Dakota, suggests negative population growth that might be due to any number of factors, including high death rates, low birth rates, and increased emigration from the area.
But the symptoms of hand, foot and mouth that confirm its victory are a skin rash and mouth sores. In a child showing all symptoms, you would notice red spots on palms and soles, and perhaps on knees, elbows or buttocks (hand, foot, mouth and rear-end disease is just too wordy).
Hand, foot, and mouth disease is generally caused by coxsackievirus A-16, which is a member of the enterovirus family. There are other types of enteroviruses that can cause the symptoms as well, but these are less common.