Immediate hypersensitivity (anaphylactic): The initial response causes no noticeable reaction. But, antigen-presenting cells (e.g., ...) have processed the antigen and presented it to T- and B-cells. What is the characteristic of the initial response in immediate hypersensitivity (anaphylactic)?
1) It causes a noticeable reaction
2) It does not cause any reaction
3) It activates T- and B-cells
4) It processes the antigen