An interference phenomenon caused by Pasteurella pestis

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Abstract
An interference phenomenon was produced by the intraperitoneal injection of broth culture dilutions of Pasteurella pestis grown at 28° C. into small white rats.At a critical level of approximately 106Past. pestis L37 marked interference was produced. Doses of 104 or 107 killed rats readily.Interference was produced by the addition of killed organisms, a cell-free vaccine or a live vaccine, to small lethal doses of L37.Non-specific interference was produced by the intravenous injection of Indian ink prior to the intraperitoneal challenge with Past. pestis L37.