What are the specific steps to measure descriptive epidemiology measurements?

• A. 1) # people affected; 2) Size of population where cases arise; 3) Length of time that population is followed
• B. Randomized trial design
• C. Assessing exposure pathways
• D. Laboratory measurement of pathogens

Answer: (A)

Descriptive epidemiology describes disease burden by measuring who is affected, in what population, and over what time. To do this, you need three pieces: the number of people affected (the case count), the population at risk in that setting (the denominator), and the time period over which cases are observed (the time component). With these, you can calculate rates such as incidence or prevalence, which summarize disease occurrence in a population during a defined interval. The steps listed—counting how many people are affected, identifying the population at risk, and specifying the length of time observed—capture this process directly.

The other options describe study approaches or methods that aren’t about describing disease burden in a population. A randomized trial design is about testing interventions, assessing exposure pathways relates to how exposure leads to disease, and laboratory measurement of pathogens focuses on identifying the disease-causing agent rather than describing how much disease exists in a population.