Question

what type of single epidemic curve allows the researcher to trace back an exposure to the same source?
secular
single epidemic
seasonal
point source
question 12 2 pts
what type of epidemic curve illustrates the cyclical changes in the number of cases of a disease?
secular
single epidemic
point source
seasonal

Explanation:

1. For the first question, a point - source epidemic curve is characterized by a rapid increase in cases followed by a decline, and it allows researchers to trace back to a common exposure source as all cases are exposed to the source around the same time.
2. For the second question, seasonal epidemic curves show cyclical changes in the number of disease cases due to seasonal factors such as weather, behavior patterns etc.

Answer:

1. D. Point Source
2. D. Seasonal