| replication of low pathogenic avian influenza virus in naturally infected mallard ducks (anas platyrhynchos) causes no morphologic lesions. | although the mallard (anas platyrhynchos) is considered an important maintenance host for low pathogenic avian influenza (lpai) viruses, viral cell tropism and pathology in naturally infected birds are largely unknown. in august 2006, we collected 19 free-living hatch-year mallards that were positive for lpai virus by real-time reverse-transcriptase polymerase chain reaction (rrt-pcr) in combined oropharyngeal and cloacal swabs. we investigated virus infection and associated lesions in the diges ... | 2011 | 21441193 |