A county health department follows 20,000 residents for 1 year after a contaminated water exposure. At baseline, 200 residents already have documented immunity to hepatitis A from prior infection, and 50 residents currently have acute hepatitis A. During the next year, 150 new cases of acute hepatitis A occur among residents who were previously unaffected. Which of the following is the annual incidence of acute hepatitis A in this population?
- A)150/19,950
- B)150/20,000
- C)200/19,750
- D)150/19,750GABARITO
- E)250/20,000
Explicação
Incidence is the number of new cases during a specified time period divided by the population at risk. The population at risk excludes residents who already had immunity and those who already had active disease at baseline, so the denominator is 20,000 minus 2... Ver explicação completa e trilha adaptativa →