1  Correct Answer = D, Explanation: The R0 is the expected number of secondary cases produced by a single typical infection in a susceptible population. Based on the most up-to-date statistics, COVID-19 is considered highly virulent with an expected R0 of at least 2.2 much higher than the R0 of seasonal flu, which is typically closer to 1.3.1
2  Correct Answer = E, Explanation: Patient typically present with lymphopenia and mildly elevated AST and ALT. Procalcitonin is normal. Patient who present with severe lymphopenia and elevated D-dimer has an associated increased risk of mortality.1