A new antiviral medication is introduced for a chronic infection in a city of 1 million people. The drug does not prevent new infections, but it markedly shortens the duration of symptomatic illness and improves recovery. One year later, epidemiologists compare disease frequency with the year before the drug was introduced. Which of the following changes is most likely?
- A)Decreased incidence and unchanged prevalence
- B)Unchanged incidence and unchanged prevalence
- C)Increased incidence and increased prevalence
- D)Decreased incidence and decreased prevalence
- E)Unchanged incidence and decreased prevalenceGABARITO
Explicação
Prevalence is driven by both incidence and average disease duration. Because the drug shortens the duration of illness without changing the rate of new infections, incidence remains unchanged while prevalence falls. This is the classic relationship that preval... Ver explicação completa e trilha adaptativa →