How bacteria are killed by homeopathic treatment?

They are not.


Possibly, some homeopathic medicines do actually have a physical effect. But most homeopathic medicines are placebos, they work through belief, it doesn't cure the infection but the person taking the medicine feels better because they believe that it is making them better.


Some homeopathic treatments are so diluted that they don't contain any active ingredient.

Another view

When consumed in an infectious disease the medicines stimulates the life force (Vital Force) which in turn attack the bacteria, viruses to cure the illness. Some of the medicines having anti-bacterial action are Curcuma Longa, Einbelia Ribes, etc