Which immunoglobulin reacts with certain antigens to release histamine, which causes Type 1 hypersensitivity reactions?

A 14-year-old girl comes to the health unit and states that she would like to receive the HPV vaccine because her parents would not let her get it when she was in Grade 6. Which one of the following actions would you take?

a. Do not give the vaccine. b. Call the parent. c. Obtain informed consent from girl, and proceed with immunization.

Assessment of a patient's skin color reveals a bluish discoloration. As a knowledgeable EMT, you should identify:

A) Pallor caused by a decrease in blood flow to the tissues B) Cyanosis caused by inadequate oxygenation of the tissues C) Erythema caused by a decrease in body temperature D) Jaundice caused by an increase in blood flow to the extremities