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The Red Cross is also a leader in research and testing to protect the safety of the blood supply. We were among the first to develop and implement testing for many infectious diseases including, HIV, hepatitis B and C viruses, West Nile virus, and more recently the agent of Chagas disease.
The Western blot test is a better test than the ELISA because it is more specific. For example, at a good lab, a positive IgG Western blot is 100% specific for exposure to the agent of Lyme Disease.