Pneumonia is an infection of the lungs that can be caused by either a bacterial or viral infection. Lobar pneumonia is a type of bacterial pneumonia that affects one or more sections of the lungs, known as lobes. Viral pneumonia is a type of pneumonia caused by a virus, such as the flu virus. Both types of pneumonia can cause symptoms such as fever, coughing, and difficulty breathing. Treatment for both types of pneumonia may include antibiotics, antiviral medications, and supportive care.