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The Zipp assay: A method for enumerating cells producing anti‐phage antibody

A cellular assay enumerating cells producing antibodies against Φ × 174 is described. Antibody‐forming cells are represented by zones of inhibited phage plaques (Zipp) in a background of confluent phage plaques. The number of Zipp‐forming cells (ZFC) is proportional to the number of immune lymphoid cells used, and the ZFC count bears a relationship to the humoral antibody level analogous to that seen with PFC and serum hemolysin titers. Primary and secondary responses in terms of the development of ZFC and of humoral antibody levels to Φ × 174 in CBA/JAX mice and in sheep are reported.