When the American Red Cross and other blood banking agencies screen donated blood for viral infections, they usually detect infection with all of the following, except:

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In Western countries, blood donated for transfusion is carefully checked for hepatitis B, hepatitis C, and the human immunodeficiency virus (HIV-the virus that causes AIDS). The likelihood of contracting HIV infection from a donated unit of blood is less than 1 in 1,900,000. Tests to detect West Nile virus infection were not widely available in 2008. The risk of contracting West Nile virus infection from a unit of blood or a transplanted organ is uncertain. The risk rises in the summer, when this mosquito-borne virus is more prevalent in the population.

When the American Red Cross and Other Blood Banking Agencies