Final answer:
The difference between selective prevention and universal prevention is that selective prevention targets individuals at higher risk, while universal prevention is for the entire population. Vaccinations are an example of universal prevention.
Step-by-step explanation:
The main difference between selective prevention administration and universal prevention administration lies in their target populations. Selective prevention strategies are aimed at individuals or a subgroup of the population whose risk of developing a disease is significantly higher than average, due to genetic, biological, or social factors. Examples might include providing targeted substance abuse programs to at-risk youth. On the other hand, universal prevention strategies are not targeted but are intended for the entire population, regardless of individual risk. An example of this is the vaccination programs intended for all children to prevent the spread of infectious diseases. Both forms of prevention are essential in public health and play critical roles in the prophylaxis of diseases.