Microbiology Immunology d769cdf2 Precipitation & agglutination are caused by: A IgG and IgM B IgM and IgG C IgM and IgA D IgD and IgA High-Yield Explanation Ans. A. IgG and IgMPrecipitation occurs with IgG when the antigen is soluble while agglutination occurs with IgM when the antigen is particulate/insoluble