There are certain routes in a person’s body that will allow pathogenic bacteria to enter and cause illness or disease. Certain routes where pathogenic bacteria will enter is through inflamed skin or there is a presence of broken skin which we may describe as having scratch or cut. This is an open wound where bacteria would likely enter the body. Another passage way is the mouth, eyes, ears or nose. Lastly, sexual transmission, when it is done in an unprotected way.