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Risk of HIV, West Nile Virus, E Coli Transmission May be Reduced Through Improved Blood Screening Methods
Date:12/28/2007

Blood donor question-and-answer style strengthened with technological advancements

CHICAGO, Dec. 28 /PRNewswire-USNewswire/ -- The blood transfusion community should consider pathogen inactivation methods as an alternative way to assure the safety and availability of the nation's blood supply, a pathologist wrote in the December issue of the American Journal of Clinical Pathology (AJCP).

"For more than 20 years we have used a method that includes asking potential donors a series of questions to determine whether or not we should use their blood," said Jeffrey McCullough, MD, FASCP, professor of laboratory medicine and pathology at the University of Minnesota.

"But now there are proactive methods available that allow us to use blood that we may not have used if we didn't get a certain answer."

His article, "Pathogen Inactivation: A New Paradigm for Preventing Transfusion-Transmitted Infections," reviews the shortcomings of the current paradigm of blood banking and what is on the horizon with newer pathogen inactivating methods.

The riboflavin method, which works by damaging DNA to eliminate its capability of regenerating, is effective for inactivating intracellular and extracellular HIV, West Nile virus, Staphylococcus, Escherichia coli and several others.

In the amotosalen method, cross-links are created, preventing harmful DNA or RNA from separating and replicating. Amotosalen also inhibits the synthesis of certain proteins, reducing the likelihood of transfusion reactions. Amotosalen treated platelets are now widely used in Europe and the riboflavin method was recently approved there. Amotosalen treated platelets are awaiting action by the U.S. Food and Drug Administration.

Finally, the RBC method cross links DNA and RNA, effectively targeting nucleic acids in pathogens. Further developments are needed to begin a new Phase 3 trial of this method in the United States.

According to the Am
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SOURCE American Society for Clinical Pathology
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