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Here's what I found out for you:
"As with any medical procedure, blood transfusions carry some risk. There is a remote chance of receiving blood of the wrong type. In addition, several infectious diseases can be transmitted by blood transfusions. Among the viruses that may be transmitted by blood are: human immunodeficiency virus (HIV), the virus that causes AIDS; human T-cell lymphotropic virus (HTLV-I); several hepatitis viruses; cytomegalovirus (CMV), and West Nile virus (WNV). However, the very small risk of acquiring such a virus is outweighed by the benefits of a blood transfusion that is needed. "
"Human T-cell lymphotropic virus, type I (or HTLV-I) is considered a leukemia virus; it differs from the virus that causes AIDS (HIV). HTLV-I is found particularly in Japanese people and in people living in the Caribbean area. HTLV-I can, on occasion, cause leukemia and a paralytic disease of the nervous system, but it takes many years to do so. "
I found the above information at the following web site. You can go there to find out the several different tests performed on donor blood to prevent recipients from becoming infected with any disease.
Hope that helps!