An additional 55 samples of substances found at a Kansas City postal service center will be tested at the Centers for Disease Control and Prevention in Atlanta as a precaution. CDC team leader Dr. Mary Chamberland says investigators are looking at very specific places. If those results indicate anthrax has spread in that office, more tests will likely be done before the stamp facility is re-opened. Public health officials have emphasized the public has not been endangered by the traces of anthrax found at the site.