Difference between pathogenic and non-pathogenic bacteria?

Pathogenic bacteria cause illness. Non-pathogenic bacteria peacefully co-exist with us and do not cause illness.

Both. Some bacterias may be pathogenic while others are quite harmless, and sometimes even useful to its host.

Pathogenic virus effects the immune system thus making the stomach and brain naseous. while pathogenic bacteria, if possible grows on the pear shaped sack that protects the heart, caused heart...

pathogenenic microorganisms cause disease. Non-pathogenenic, not.

A pathogenic bacteria is one that can be broadly described as causing an illness. Spoilage bacteria contribute to the decomposition of something after death.