Final answer:
a. The prevalence of people with histoplasmosis antibodies at the first survey is 0.5%. b. To calculate the prevalence of people with histoplasmosis in the second survey, divide the number of people with antibodies in the second survey by the total number of people surveyed in the second survey and multiply by 100. To calculate the 1-year incidence rate, subtract the number of people with antibodies from the second survey by the number of people with antibodies from the first survey.
Step-by-step explanation:
a. To calculate the prevalence of people with histoplasmosis antibodies at the first survey, divide the number of people with antibodies (25) by the total number of people surveyed (5,000) and multiply by 100 to get the percentage.
Prevalence = (25 / 5,000) * 100 = 0.5%.
b. To calculate the prevalence of people with histoplasmosis in the second survey, divide the number of people with antibodies in the second survey (35) by the total number of people surveyed in the second survey and multiply by 100.
Prevalence = (35 / total number of people surveyed in the second survey) * 100.
To calculate the 1-year incidence rate, subtract the number of people with antibodies from the second survey (35) by the number of people with antibodies from the first survey (25).
1-Year Incidence Rate = (Number of new cases / total number of people surveyed in the second survey) * 1000.