In two groups, each containing 56 Pasteurella multocida strains of avian origin, the percentage of multicin-producing strains was 80.4 and 71.4. In two groups containing 46 and 58 isolates tested for sensitivity to multicins, 82.6% and 62.1% respectively were listed as indicators. P. multocida strains producing bacteriocins were active on a range of 1-33 indicators. A preliminary multicin typing system was set up with the use of eight selected indicators; 52% of multicin-producing strains acted on one indicator only. P. multocida serotypes and serologically untypable strains were subdivided into multicin types.
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