Different parts of our body are inhabited by different types of bacteria. These live in harmony, and regulate each other’s growth without causing a reaction (infection) in our body.
A reaction (infection) will happen if either:
- a bacteria native to one part of our body invades another. E.g. Bacteria from the skin entering the blood stream
- a bacteria is transmitted from an external source into the patient’s body. E.g. Patient to patient transmission of Clostridium Difficile causing severe diarrhea
- we take an antibiotic that suppresses the growth of one native bacteria, and disrupts the balance. E.g. Vaginal thrush caused by overgrowth of candida albicans (fungus)