hypersensitivity hypersensitivity reaction hypersensitivity reaction Immediate hypersensitivity reactions http://emedicine.medscape.com/article/136217-overview IgE mediated IgE reactions hypersensitivity http://emedicine.medscape.com/article/136217-overview Type 2 hypersensitivity reactions hypersensitivity reaction hypersensitivity reaction emedicine.medscape.com http://emedicine.medscape.com/article/136217-overview hypersensitivity reaction Medscape hypersensitivity reaction hypersensitivity Type 2 hypersensitivity reactions or other molecular immune responses