Exam 24: Immunity and Host Defense

A child is stung by a bee at the beginning of the summer and has mild swelling and itching at the site of the sting.In late summer,the child is stung again,but this time rapidly develops anaphylaxis and is diagnosed with type I hypersensitivity to bee venom.If the child is allergic to bee venom,why was there no reaction after the first bee sting? What specifically happened after the first sting that led to the allergic reaction?

Infants acquire natural passive immunity from maternal antibodies transferred across the placenta or in breast milk.

The unique antigen-reactive proteins of T cells are

After the first exposure to an antigen,a ________ stimulates growth and multiplication of antigen-reaction cells.

Differentiate between T-cytotoxic (T_C)cells and T-helper (T_H)cells.

How do phagocytes interact speedily and effectively with pathogens?

All the following can cause contact dermatitis EXCEPT