6. Negative phase is observed in

A. secondary humoral response
B. primary humoral response
C. both (a) and (b)
D. none of the above

7. Method(s) that can be used to detect CMI is/are

A. migration inhibition
B. target cell destruction factor test
C. skin test for delayed hypersensitivity
D. all of the above

8. In which of the following cell-mediated immunity (CMI) participates?

A. Delayed hypersensitivity reaction
B. Graft versus host reaction
C. Allograft rejection
D. All of the above

9. Overactivity of Th cells may result into

A. autoimmunity
B. optimal antibody response
C. optimal cell-mediated response
D. none of the above