How do bacteria and viruses enter the body?
Viruses and bacteria are everywhere, but they do not always cause infections. An infection happens when a disease-causing organism enters a body system (e.g., respiratory, reproductive, or digestive system) where conditions allow it to live and multiply. Whether or not this happens depends on how the organism enters the body, what kind and how many viruses and bacteria are contacted, and the health of the person involved. This can be through open woulds and lesions, poor hygiene, and any open orifice (eyes, ears, nose, mouth, urinary tract, genitals or anus). The first link below has a great graphical representation of just how your body gets invaded by bacteria and viruses and is worth a look.
