Question

polio is a disease that was almost eradicated, but there are still new cases that appear due to the failure to immunize all children. researchers keep close tabs on how many new cases of this disease occur each year in the hope that it will soon cease to exist. this enumeration is an example of

incidence.
frequency.
prevalence.
duration.

Explanation:

• Incidence refers to the number of new cases of a disease in a population over a specific period. In this case, researchers are tracking new cases of polio each year, which aligns with the definition of incidence.
• Frequency is a more general term and does not specifically denote new cases.
• Prevalence is the total number of cases (both new and existing) in a population at a given time.
• Duration refers to the length of time a disease lasts in an individual.

Answer:

incidence.