Differentiate the types of hypersensitivity mechanisms. Differentiate the types of hypersensitivity mechanisms. Janet, a 20 year-old college student, is experiencing a five-week history of itchy eyes and nasal congestion with watery nasal discharge. She also complains of a “tickling” cough, especially at night, and she has had episodes of repetitive sneezing. Janet gets frequent “colds” … Continue reading Differentiate the types of hypersensitivity mechanisms.