Test Details: Viral pneumonia causes inflammation in the lungs, leading to abnormal exchange of oxygen and carbon dioxide in the alveoli. Viruses that are known to cause viral pneumonia include influenza A virus, parainfluenza virus, respiratory syncytial virus, human metapneumovirus, rhinovirus, coronavirus, adenovirus, enteroviruses, hantavirus, herpes virus, varicella-zoster virus, and measles virus (rubeola).