Transconjugant P strains similar to VA4 parent strain in morphology have acquired the SQP1 plasmid and expressed the ability of inhibiting bacteria with genetic stability.

• 接合子p菌株的形态特征和亲株VA4相似,但却获得了产生抑制细菌的抗生素的能力,这种抑制细菌的能力在遗传上是稳定的。