text: what is walking pneumonia? is it really seriuos? can you still exercise while having it? walking pneumonia is an outdated term referring to pneumonia (infection of the small air-filled sacs of the lung) which does not cause significant disability. people who are affected by walking pneumonia do not require hospitalization and are often able to continue participating in school or work functions. although these mild cases of pneumonia can be caused by any number of microorganisms, infection with viruses such as influenza and respiratory syncytial virus or atypical bacteria such a mycoplasma pneumoniae, chlamydophila pneumoniae, or legionella pneumophila are the most common causes.  treatment, when necessary, is typically with oral antibiotics such as amoxicillin, a macrolide like azithromycin or clarithromycin, or a fluoroquinolone, e.g., levofloxacin. prognosis is excellent with symptoms typically resolving after a week or less.