The sensitivity of the agar gel immunodiffusion (AGID) test for the detection of antibody to caprine arthritis-encephalitis virus (CAEV) was investigated with CAEV or ovine progressive pneumonia virus (OPPV) as the source of antigen. A total of218 goat serum specimens were tested for anti-CAEV antibody by AG!D and immunoprecipitation of [33Sjmethionine-labeled CAEV. In comparison with that of immunoprecipitation, the
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