A vaccine is given to produce artificial active immunity. Once a person has received a vaccine, there is a time interval before long-term immunity to the disease develops. Which statement about this time interval accounts for this delay?
- ANo memory cells have been produced from B-lymphocytes.
- BNo plasma cells have been produced from B-lymphocytes.
- CThe primary immune response has not produced enough antibodies.
- DThe secondary immune response has not produced enough antibodies.