Why are microbes found in specific areas?
Due to different environments.
Some bacteria like dry, others like wet. H. pylori can survive in the stomach at a pH of 1-2, where no other bacteria can survive. Some bacteria have adaptions such as Enterococcus's ability to destroy bile (which normally destroys other bacteria).
"Exo" Body Parts
Anything on the outside of your body. This includes your GI tract. Your GI tract is essentially a giant hole that goes throughout you.
Not all hosts are equal.
Factors that influence a pathogen's ability to "set up shop" include...
- Vaccination status
- Nutritional status
- Exposure history
- Immune system status
Some diseases you find cause you to ask if there is an issue with the host.
Group B Steptococcus
Common Bacteria for CNS Infections
Common Bacteria for Upper Respiratory Infections
Common Bacteria for Lower Respiratory Infections
Common Bacteria for GI Infections
Common Bacteria for Genito-Urinary Infections
Common Bacteria for Bone/Joint Infections
Common Bacteria for Skin Infections
Many others depending on exposure