An infection is the entry of microorganisms (for example viruses, fungi or bacteria) into an organism and their colonization and reproduction. In a broader sense, infectious diseases are also referred to inaccurately as "infections"[1]

Infections in persons with few symptoms are rare, but possible. Cases have been described of less symptomatic/asymptomatic people who carry a high viral load and are infectious (superspreaders). However, exact numbers do not exist.