U.S. finds low-risk H5N1 bird flu strain in ducks Fri Sep 1, 2006 5:43pm ET By Charles Abbott WASHINGTON (Reuters) - Mallard ducks in Maryland have tested positive for bird flu, apparently a common, less pathogenic strain that poses no risk to humans, the U.S. Agriculture and Interior departments said on Friday. The H5N1 avian influenza virus was found in fecal samples from "resident wild" mallards in Queen Anne's County in Maryland, on the U.S. central Atlantic coast. "Testing has ruled out the possibility of this being the highly pathogenic H5N1 strain that has spread through birds in Asia, Europe...