Do vaccines produce active or passive humoral immunity? Explain your answer. Why is passive immunity less satisfactory? Describe the specific roles of helper, regulatory, and cytotoxic T cells in...

Do vaccines produce active or passive humoral immunity? Explain your answer. Why is passive immunity less satisfactory?

Describe the specific roles of helper, regulatory, and cytotoxic T cells in normal cellular immunity.

Define hypersensitivity. List three types of hypersensitivity reactions. For each, note whether antibodies or T cells are involved and provide two examples.