Epidemiology is the best way to prevent occupational disease because it involves counting actual disease cases and not just reducing exposures to hazardous agents. Instruction about condom use in high schools leads to increased frequency and earlier sexual activity. A surgeon who is positive for the HIV virus does not represent a clinically significant risk of passing on the virus to patients on whom he or she is operating. The leading cause of death of children 5 years and younger is drowning. The number of people using seat belts while riding in cars has decreased in the last decade.
Alcohol is responsible for about half of all fatal car accidents.
The rate of suicide in highest among young white males. Habitual smokers regularly start smoking before the age of 18. In the cycle of a respiratory infection, a person is most infectious during the fastigium stage. Vaccinating infants against Hepatitis B is a sample of passive immunity. County public health laws can be less restrictive than state or federal ones.