A population pyramid, also called an age pyramid or age picture is a graphical illustration that shows the distribution of various age groups in a population (typically that of a country or region of the world), which forms the shape of a pyramid when the population is growing.
Hand, Foot, and Mouth Disease Symptoms & Signs. The symptoms of hand, foot, and mouth disease are typically mild and occur mainly in children during the spring and fall seasons. Symptoms can include fever, malaise, decreased appetite, and sore throat. A rash is characteristic of this viral disease.
The signs and symptoms of hand-foot-and-mouth disease include a fever and small but painful sores on the throat, gums, and tongue and inside the cheeks. It also may cause a rash, often with blisters, on the hands, soles of the feet, and diaper area, as well as headaches and a poor appetite.