A<unk>  <unk>  is a virus, parasite, or other potential pathogen that can be<unk>  in donated blood through a<unk>  to a recipient. The term is usually limited to known pathogens, but also sometimes includes agents such as Simian foamy virus which are not known to cause disease. Preventing the spread of these diseases by blood<unk>  is addressed in several ways. In many cases, the blood is tested for the pathogen, sometimes with several different methodologies. Donors of blood are also screened for signs and symptoms of disease and for activities that might put them at risk for<unk> . If a local supply is not safe, blood may be imported from other areas. Human immunodeficiency virus (HIV) leads to the best known of the<unk><unk>  diseases, acquired immune deficiency syndrome (AIDS). Blood that is processed into medications by fractionation is treated in a multi-step process called pathogen inactivation that is analogous to pasteurization: it destroys most viruses and bacteria in the blood. Donors are still screened and tested.
Transfusion transmitted infection
Transfusion associated circulatory overload
Culture-bound syndrome
Gulf War syndrome
Transfusion-associated graft-versus-host disease
Transfusion-related immunomodulation
Transfusion-related acute lung injury
Delayed hemolytic transfusion reaction