Pittsburgh Post Gazette, July 15, 2007 WASHINGTON -- The growth of America's Hispanic population could contribute to a serious imbalance in the nation's blood supply. Experts say Hispanics predominantly have type-O-positive blood, which means there has been a steady rise in the demand for that type in areas of the country where many Latinos live. But because Hispanics as a whole tend to donate blood less often and in fewer numbers than other U.S. population groups, this could soon lead to a dangerous shortage in the supply of O-positive blood, according to University of Texas Medical Branch professor Alexander Indrikovs. Caucasians account for more than 80 percent of all donations, experts say. What's needed is an education and advertising campaign designed to boost donations from Hispanics and other minority groups, Mr. Indrikovs said.