How does some bacteria become immune to some antibiotics?

One should always consults a doctor but antibiotics should not be taken when a person has E.coli. Products such asImmodium AD should also be avoided. These can exacerbate the situation.

: It is not clarified in question where infection is. Urinary and vaginal infections caused by e-coli are often treated by antibiotics, unfortunately not very successful lately. ;

: Answer can be yes and no. E-coli is not resistant to all antibiotics, but certainly it is becoming resistant to majority of them. : E-coli easy mutate from one strain to another, and antibiotics helping less and less. This is specially case in urinary and vaginal tract infections caused by this bacteria, where doctors prescribing antibiotics without control, and making more damage than good.