Walking pneumonia is caused by which organism?

Walking pneumonia is caused by which organism?

• A. Mycoplasma pneumoniae
• B. Streptococcus pneumoniae
• C. Chlamydophila pneumoniae
• D. Haemophilus influenzae

Answer: (A)

Walking pneumonia refers to a milder, atypical form of pneumonia that typically affects younger people. The organism most characteristically linked to this presentation is Mycoplasma pneumoniae. This microbe is unique among bacteria because it lacks a cell wall, so it does not Gram stain and isn’t seen on standard bacterial culture; diagnosis often relies on serology or PCR rather than routine culture. Clinically, infection tends to start with a gradual, persistent dry cough and fatigue, with only low-grade fever, and chest imaging shows diffuse interstitial or patchy peribronchial infiltrates rather than a single lobar consolidation. Because of its atypical nature, treatment targets organisms like Mycoplasma with macrolides or doxycycline rather than beta-lactam antibiotics. Other organisms can cause pneumonia, but Mycoplasma pneumoniae remains the classic cause of walking pneumonia.

Walking pneumonia refers to a milder, atypical form of pneumonia that typically affects younger people. The organism most characteristically linked to this presentation is Mycoplasma pneumoniae. This microbe is unique among bacteria because it lacks a cell wall, so it does not Gram stain and isn’t seen on standard bacterial culture; diagnosis often relies on serology or PCR rather than routine culture. Clinically, infection tends to start with a gradual, persistent dry cough and fatigue, with only low-grade fever, and chest imaging shows diffuse interstitial or patchy peribronchial infiltrates rather than a single lobar consolidation. Because of its atypical nature, treatment targets organisms like Mycoplasma with macrolides or doxycycline rather than beta-lactam antibiotics. Other organisms can cause pneumonia, but Mycoplasma pneumoniae remains the classic cause of walking pneumonia.