These super strong bacteria are called superbugs
This means that traditional antibiotics like penicillin fail to kill superbug bacteria
Medical researchers believe that bacteria sometimes change if they are exposed to the same antibiotic many times.
If a person has a cough or the flu every winter they usually go to the doctor.
The docter then prescribes an antibiotic for that specific disease the flu.
But doctors have found that after maybe 8 0r 10 years the antibiotic no longer works effectively to stop the flu or cough.