31. How does disease Incidence differ from disease prevalence? OF. None of the answers are correct. O D. Incidence is measured prospectively, prevalence is measured retrospectively. A. Incidence is the frequency of new cases, prevalence is the frequency of existing cases. E All answers are correct C. Incidence measures therapeutic effects, prevalence does not. B. Incidence depends upon diagnostic accuracy, prevalence does not. Question 32 1 pts 32. Which of the following statements are true about the COVID-19 pandemic? E. A. B and C are all correct D. Only B and C are correct. B. COVID-19 is caused by a coronavirus that is highly contagious and may cause life threatening pneumonia in those who are infected. A. COVID-19 was the leading cause of death in the USA during 2020. C. SARS CoV-2 enters respiratory cells by attaching to the ACE-2 receptor