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A blood-borne disease is one that can be spread by contamination by blood.
The most common examples are AIDS, hepatitis B, and hepatitis C.
Diseases that are not usually transmitted directly by blood contact, but rather by insect or other vector, are more usefully classified as vector-borne disease, even though the causative agent can be found in blood. Vector-borne diseases include West Nile virus and malaria.
Many blood-borne diseases can also be transmitted by other means.
Since it is difficult to determine what pathogens any given blood contains, and some blood-borne diseases are lethal, standard medical practice regards all blood (and any body fluid) as potentially infective. Blood and Body Fluid precautions are a type of infection control practice that seeks to minimize this sort of disease transmission.
Blood for blood transfusion is screened for many blood-borne diseases.
Needle exchanges are an attempt to reduce the spread of blood-borne diseases in intravenous drug users.
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