Infection

An infection, colloquially "infection", is the active or passive penetration, attachment and multiplication of pathogens into a host. (macro-organism). Symptoms associated with an infection are called an infectious disease. If an infection doesn't cause symptoms, it's called an inapparent infection. Such infections can nevertheless leave behind immunity against further infections with the same pathogen (silent celebration). Infections are researched in basic science by infection biology and treated by clinical infectiology. https://de.wikipedia.org/wiki/Infektion