Cover photograph (Copyright © 2007, American Society for Microbiology. All Rights Reserved.): Human airway epithelium was infected with avian influenza A virus A/Duck/Singapore/5/97 (H5N3). At 24 h postinfection, viral antigen was found localized in ciliated epithelial cells by costaining for avian influenza A virus nucleoprotein (green) and β-tubulin IV antibody (red). Photomicrographs were acquired by using a Leica inverted DM IRE2 confocal laser-scanning microscope. (See related article in August 2006: vol. 80, no. 16, page 8060.)