A reservoir host can harbour a pathogen indefinitely with no ill effects, with important implications for disease control. A single reservoir host may be reinfected several times. A host of predilection is the one preferred by a parasite. An amplifying host is one in which the level of pathogen can become high enough that a vector such as a mosquito that feeds on it will probably become infectious.
Trends in the rates of treatment for ADHD were presented by age, gender, race, family income, and health insurance status. Trends in ADHD treatment were also determined by annual numbers of visits, use of pharmacotherapies, and types of health care professionals. RESULTS: The rate of outpatient treatment for ADHD increased from 0.9 per 100 children in 1987 to 3.4 per 100 children in 1997.
Attention deficit hyperactivity disorder (ADHD) is one of the most common childhood disorders and can continue through adolescence and adulthood.Symptoms include difficulty staying focused and paying attention, difficulty controlling behavior, and hyperactivity (over-activity).DHD is one of the most common childhood disorders and can continue through adolescence and into adulthood. The average age of onset is 7 years old. ADHD affects about 4.1% American adults age 18 years and older in a given year.