Blood Filter (IMAGE) American Chemical Society Caption Researchers report development of a special blood filter (shown) that removes the human form of mad cow disease when used during blood transfusions. Credit Credit: Photo courtesy of MacoPharma. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.