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.
Other things to know about hand, foot, and mouth disease include that: 1  HFMD is usually caused by the coxsackievirus A16 virus, although other enteroviruses can cause this type of infection. 2  Coxsackievirus A6 has been causing more severe and atypical cases of HFMD in the United Sates since 2007, including in adults.