The defect of cell outer wall is called wall deficient or L-type bacteria in medicine  Taking penicillin for the treatment of Staphylococcus aureus as an example, when the dose is sufficient and the action time is sufficient, the synthesis of Staphylococcus cell wall is seriously blocked, resulting in the failure of reproduction and death; If the antibiotic dose is insufficient or the course of treatment is too short, some of the Staphylococcus with strong endurance can be preserved in the form of cell wall defect  This cell is called Staphylococcus aureus L-form
These flawless bacteria can still reproduce and repair into the original bacteria sooner or later
Bacterial cell wall damage