This is a quite comprehensive video on Hypersensitivity IV. This video contains classification of type IV hypersensitivity and related examples. At end, there are review question which help you in strengthening your grip on the topic. Timeline 0:00 Introduction 0:25 Hypersensitivity IV 0:41 Helper T cell mediated Hypersensitivity type IV. 3:12 Delayed response of Hypersensitivity IV 3:50 Examples of Hypersensitivity IV 4:52 Cytotoxic T cell mediated Hypersensitivity type IV 6:09 Review questions