ELISA is a biochemical technique used in immunology to detect antibodies or antigens in a sample. It works by attaching an unknown antigen to a surface, applying the antibody, and adding a substance to detect the antigen-antibody complex through a detectable signal like fluorescence. ELISA is useful for medical tests like HIV and West Nile Virus tests. Hives are itchy red welts on the skin caused by allergic reactions. Symptoms include raised, clearly defined welts that come and go and itch. Treatment includes avoiding irritants and using antihistamines. Hives are triggered by allergens like foods, medications, animals and more. Nosocomial infections are infections contracted