Human Metapneumovirus (HMPV) strain/isolate TN/93-32 group B2. Scanning electron micrograph (SEM) of an African Green Monkey Kidney Epithelial cell (Vero cell line) infected with HMPV for 3 days. The image shows a sea of long filamentous enveloped particles (pink) obscuring the plasma membrane of the infected cells. These infections can cause "cold-like" symptoms similar to other viruses that cause upper and lower respiratory infections (RSV, Rhinovirus, Influenza) ranging from mild symptoms such as cough, fever, nasal congestion, and shortness of breath to more severe bronchitis or pneumonia. Magnification: 5000 x when printed 10 centimetres wide. Specimen courtesy of Virology Research Services Ltd (Scott Lawrence).