Respiratory Syncytial Virus A (RSV A). Scanning electron micrograph (SEM) of a HEp2/HeLa cell (Human epithelial cell line) infected with RSV A (Strain Long). The image shows long filamentous enveloped particles (purple) emerging from the cell plasma membrane alongside apoptotic blebs (pink) bulging from the cell surface. Respiratory syncytial virus is a common respiratory virus that usually bronchiolitis and pneumonia requiring hospitalization. Magnification: x5600 when printed 10 centimetres wide. Specimen courtesy of Virology Research Services Ltd (Scott Lawrence).