Describe6 marksChallenge
A rabbit was injected with a harmless antigen (ovalbumin) on day 0 and a second injection of the same antigen on day 60. Antibody concentration in the blood was measured at various time points. The results are shown in the table below.
| Day | Antibody concentration (arbitrary units) |
|---|---|
| 0 | 0 |
| 5 | 2 |
| 10 | 15 |
| 15 | 40 |
| 20 | 35 |
| 60 | 5 |
| 65 | 50 |
| 70 | 120 |
| 75 | 100 |
| 80 | 80 |
Describe the differences between the primary and secondary immune responses shown in the table. Explain these differences in terms of the roles of phagocytes, B-lymphocytes, T-lymphocytes, and memory cells.