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According to the CDC, the estimated number of persons living with AIDS in the United States...

  1. According to the CDC, the estimated number of persons living with AIDS in the United States in 2004 was 397,582. In 2005, 40,608 new cases of AIDS were reported in the U.S. The estimated mid-year population of the U.S. in 2005 was 296,410,404. Calculate the prevalence rate and incidence rate of AIDS in the U.S. in 2005.
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Answer #1

(A) Prevalence rate = [(number of new cases)/(total population at risk)]*1000

where number of new cases = 40608 and total population = 296410404

Prevalence rate = (40608/296410404)*1000

= 0.000137*1000

= 0.137 per 1000 person

(B) Incidence rate = [(number of new cases+existing cases)/(total population at risk)]*1000

where number of new cases = 40608, existing cases= 397582 and total population = 296410404

Incidence rate = ((40608+397582)/296410404)*1000

= 0.0014783*1000

= 1.478 per 1000 person

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