We want to assess how two different schools have responded in addressing the COVID-19 pandemic. Use the information below to answer the questions that follow.

At the start of the week, School A has 500 students and staff. Testing reveals that 55 of them have COVID-19 and 30 are still sick by the end of the week. During the week, 35 students/staff develop new cases of COVID-19 and all are still sick by the end of the week. In addition, 50 healthy students without COVID-19 leave the school in the middle of the week.

At the start of the week, School B has 250 students and staff. Testing reveals that 35 of them have COVID-19 and 10 are still sick by the end of the week. In addition, 25 staff members have been vaccinated and are presumed to be immune from COVID-19. During the week, 10 students/staff develop new cases of COVID-19 and all are still sick by the end of the week.

Which school has a greater burden of COVID-19 at the START of the week? Which measure do you use? Incidence or prevalence? Provide calculations to justify your answer.

]Which school is the risk of developing COVID-19 DURING the week greater? Which measure do you use? Incidence or prevalence? Provide calculations to justify your answer.

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