Which of the following is an example of precipitation reaction?
Precipitation is a method for detecting an antigen-antibody reaction. When antigen and antibody combine in the proper propoions, a visible precipitate is formed. Optimum antigen-antibody ratios can be produced by allowing one to diffuse into the other, most commonly through an agar matrix (immunodiffusion). Counterimmunoelectrophoresis (CIE) is a type of precipitation reaction where immunodiffusion carried out in an electrophoretic field. Both the speed and the sensitivity of immunodiffusion are improved by CIE. Ref: Ray C.G., Ryan K.J. (2010). Chapter 4. Principles of Laboratory Diagnosis of Infectious Diseases. In C.G. Ray, K.J. Ryan (Eds), Sherris Medical Microbiology, 5e.
Widal Test
Coomb's Test
Counter Current immunoelectrophoresis
Weil-Felix Test