It keeps them healthy and helps them grow better. Public health groups have opposed the practice because bacteria continually exposed to antibiotics will eventually develop resistance to them.

VOA: standard.2010.07.21

So bacteria that get an unloaded plasmid are going to have resistance to antibiotics.

得到无DNA片段质粒的细菌,就会对抗生素有抗性

耶鲁公开课 - 生物医学工程探索课程节选