Question

question 12 what most likely happens to incidence and prevalence of zombie-ism in the following scenario: a zombie virus has wiped out most of north america. interestingly, the zombies are not deteriorating on their own; they can live forever. however, a new vaccine is developed that not only prevents people from becoming zombies, but will kill the zombies that already exist. this new vaccine can be deployed in the air by plane. a) incidence stays the same, but prevalence decreases. b) prevalence stays the same, but incidence decreases. c) both incidence and prevalence stay the same. d) both incidence and prevalence decrease.

Explanation:

• Incidence refers to new cases of a condition (becoming a zombie). The vaccine prevents new infections, so new cases (incidence) will decrease.
• Prevalence refers to the total number of existing cases (zombies alive). The vaccine kills existing zombies, so the total number of zombies (prevalence) will also decrease.
• Option A is wrong because incidence doesn't stay the same (vaccine prevents new cases). Option B is wrong as prevalence decreases (zombies are killed). Option C is wrong as both change. Thus, both incidence and prevalence decrease.

Answer:

D. Both incidence and prevalence decrease.