Natural reservoir
(重定向自Infection reservoir)
A natural reservoir or nidus (the latter from the Latin word for "nest") is the long-term host of a pathogen of an infectious disease. Hosts often do not get the disease carried by the pathogen or it is carried as a subclinical infection and so asymptomatic and non-lethal. Once discovered, natural reservoirs elucidate the complete life cycle of infectious diseases, providing effective prevention and control.