Human microbiota and the focal theory revelation: an overview

A microorganism that is not visible to the naked eye. Over the past centuries, scientists have discovered better ways to observe and understand germs. The human microbiota regulates the health of the host through the good bacteria that maintain a balance of body (eubiosis) to have an adequate immune response. Any factor that acts negatively on the composition of the microbiota can induce dysbiosis and therefore in a state of disease per host. This could be linked to the so-called focal infection theory of to explain some pathological conditions. The focal infection theory is the historical concept that many chronic diseases, including systemic and common ones, are caused by focal infections. A focal infection is a localized infection, which can often be asymptomatic, causing disease in other parts of the body. However focal infections are quite rare and limited to quite rare diseases. Distant injury is the key principle of focal infection, whereas in ordinary infectious disease, the infection itself is systemic. The focal infection theory, rather, thus explained virtually all diseases, including arthritis, atherosclerosis, cancer, and mental illness.