Detection of bacteriophage‐antibody complexes by agarose gel electrophoresis

To detect bacteriophage‐antibody complexes, specific antiserum has been incubated with bacteriophages and antiserum‐induced aggregation has been detected by agarose gel electrophoresis, using differential sieving of the gel to fractionate aggregates by size. Agarose gel electrophoresis should also be of use in monitoring reaction of other virus‐sized antigens with antibodies.