Where in the human body can pathogenic bacteria live?

There are bacteria that are essential to our life, such as those involved in the digestion process. There are also opportunistic bacteria that are not always dangerous to us. There are also pathogenic bacteria that can cause disease and malfunction of organ systems. They live mainly in the digestive system: mouth, esophagus, stomach, intestines. They can also live in the urinary tract. But most of them can be found on the skin. Therefore, you need to remember the rules of hygiene.