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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 a cell (green) with long filamentous virus particles (purple) emerging from the cell plasma membrane alongside apoptotic blebs bulging from the cell surface. Respiratory syncytial virus is a common respiratory virus that usually causes mild, cold-like symptoms. Most people recover in a week or two, but RSV can be serious. Infants and older adults are more likely to develop bronchiolitis and pneumonia requiring hospitalization. Magnification: x 2400 when printed 10 centimetres wide. Specimen courtesy of Virology Research Services Ltd (Scott Lawrence). (KEYSTONE/SCIENCE PHOTO LIBRARY/STEVE GSCHMEISSNER)