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Eight strains of Salmonella pullorum isolated from epidemiologically independent cases of pullorum disease (bacillary white diarrhoea) in young chickens possessed at least one large molecular mass plasmid in addition to smaller molecular mass plasmids. The 85 kb large plasmid, designated pBLOOl, of one of these strains was 'tagged' with an ampicillin resistance marker by the insertion of transposon Tn3. The plasmid was eliminated by passage in nutrient broth containing acridine orange. It wasdoi:10.1099/00221287-134-8-2307 pmid:3253408 fatcat:3mpnl4mubfanlko77vjv72sexq