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.
Hand-foot-and-mouth disease may cause all of the following signs and symptoms or just some of them. They include: 1  Fever. 2  Sore throat. 3  Feeling of being unwell (malaise). 4  Painful, red, blister-like lesions on the tongue, gums and inside of the cheeks.