Definitions. 1  Age distribution > Population aged 0-14: Percentage of total population aged 0-14. 2  Age structure > 0-14 years: The distribution of the population according to age. 3  Birth rate: The average annual number of births during a year per 1,000 persons in the population at midyear; also known as crude birth rate.
Hand-foot-and-mouth disease, or HFMD, is caused by a virus. Symptoms include ulcers, or sores, inside or around the mouth, and a rash or blisters on the hands, feet, legs, or buttocks. And while it's not pleasant, it also isn't serious. Anyone can get the disease, but children under age 10 are most likely to catch it.
Along with painful mouth sores, hand, foot and mouth disease causes fever and a rash on both the hands and the feet. Hand, foot and mouth is due to a virus that lives in the intestines, and it is very contagious, said William Schaffner, an infectious diseases specialist at Vanderbilt University. He noted that late summer and early fall are when enteroviruses -- those related to the intestines -- seem to spread readily.