SARS-CoV-2 is more contagious in humans than SARS because it has been shown that     SARS-CoV-2 emerged from bats that were superspreaders.     SARS-CoV-2 was derived from SARS by antigenic shift.     There are more than 1 correct answers in the other choices     if X number of SARS-CoV-2 particles would infect Y number of respiratory epithelial cells, higher (than X) number of SARS particles would be required to infect Y number of the same cells.

A monoclonal antibody molecule has only one Fab domain, while a polyclonal antibody has two Fab domains capable of binding two different epitopes. True O False

Compare Ebola Virus to SARS-CoV2 with respect to the following parameters: Virus interactions with host innate immune system Virus interactions with host adaptive immune system Pathophysiological effects of viral infection

(M/C) Which statement is the best with respect to the role of the different arms of the immune system in defending against this virus based on the graph below? Infection of mice that are wild type or have the indicated protein or cell deletions 120 100 60 80 % Survival 40 20 20 0 wild type RIGI minus Toll receptor minus INF a/ẞ minus CD8 T cell minus INF a/ẞ + CD8 T cell minus 0 2 4 6 8 10 12 Days after infection The innate immune response alone is usually enough to survive viral infection. ○ The adaptive immune response alone is usually enough to survive viral infection. Innate immunity plays a much larger role than adaptive immunity for survival. Both innate and adaptive immunity play about equal roles in survival.