Abstract
One hundred field isolates of Salmonella dublin were differentiated from the part-rough vaccine strain HWS 51 by means of four different bacteriophages. The isolates were also classified by fermentation of four carbohydrates. Twenty-eight yielded phage and fermentation reactions identical to those of the vaccine strain HWS 51. Forty-eight were classed as smooth strains and 24 as part-rough, but quite distinct from the part-rough vaccine strain. All 28 vaccine-like strains belonged to the same biotype (E) in contrast to the wide variations in biotype found with the smooth and the other part-rough strains.
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