Bacterium
Mycoplasma pneumoniae
No cell wall atypical bacterium
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High-yield clue
No cell wall + atypical respiratory vocabulary + cold agglutinin teaching clue.
Overview
An atypical bacterium used to teach the absence of a cell wall, pleomorphic morphology, and walking-pneumonia coursework vocabulary.
Classification
- Atypical bacterium
- No peptidoglycan cell wall
- Pleomorphic
Lab & identification clues
- Gram stain is not useful as a primary anchor
- NAAT/serology vocabulary
- Fried-egg colony term appears in older teaching
Associations
- Atypical pneumonia vocabulary
- Cold agglutinin concept
- Macrolide-resistance discussion
Commonly confused with
- Legionella pneumophila
- Chlamydia pneumoniae
- Streptococcus pneumoniae
Your notes
Original student-study summary. Sources checked: OpenStax Microbiology 2e, NCBI Bookshelf Medical Microbiology, and CDC topic pages where applicable; reviewed 2026-06. Educational only; no diagnosis, treatment, dosing, or specimen-handling guidance.