Overview
Aerobic and anaerobic classifications describe how bacteria relate to molecular oxygen for growth and survival, determining which laboratory atmospheres can recover them.
Classification
| Category | O₂ | Where it grows in lab |
|---|---|---|
| Obligate aerobe | Required | Aerobic (± CO₂) plates |
| Facultative anaerobe | Optional | Aerobic and anaerobic plates |
| Microaerophile | Low level | Microaerophilic systems |
| Obligate anaerobe | Absent | Anaerobic systems |
| Aerotolerant | Survives | May appear weakly aerobically |
Morphologic Features
Oxygen category is not visible as a unique Gram morphology. Mixed morphologies in abscess smears often prompt dual-atmosphere culture.
Laboratory Characteristics
- Anaerobic transport vials/tubes
- Paired aerobic/anaerobic media sets
- Indicator strips / catalyst QC
- Extended anaerobic reading schedules
Reference Intervals
Anaerobic hold times, acceptable transport delays, and ID methods are institutional, verify SOPs locally.
Clinical and Laboratory Significance
Correct atmosphere matching is required for valid recovery of anaerobes and for interpreting mixed aerobic–anaerobic infections.
Differential Considerations
Distinguish obligate anaerobes (anaerobic-only growth) from facultatives (both atmospheres). Distinguish true anaerobe absence from transport failure or inadequate anaerobiosis.
Comparison Tables
Atmosphere growth patterns
| Growth pattern | Suggests | Caution |
|---|---|---|
| Aerobic only | Aerobes / facultatives preferring air | Does not exclude missed anaerobes if setup incomplete |
| Both atmospheres | Facultative organisms | May coexist with anaerobes in mixed cultures |
| Anaerobic only | Obligate anaerobe likely | Confirm ID; verify not failed aerobic inoculation |
Classification Frameworks
Not applicable.
Laboratory Notes
- Hedge anaerobic ID algorithms and critical lists as local
- Never skip indicated anaerobic cultures for deep sites
- No antimicrobial selection from oxygen category
References
Authoritative textbooks, guidelines, and reviews supporting this reference entry. Verify reference intervals, critical limits, and reflex criteria against institutional protocols and current guideline editions.
Textbooks
- Forbes BA, Sahm DF, Weissfeld AS. Bailey & Scott's Diagnostic Microbiology. 15th ed. Elsevier; 2020.
- Mahon CR, Lehman DC, Manuselis G. Textbook of Diagnostic Microbiology. 6th ed. Elsevier; 2018.
- Carroll KC, Hobden JA, Miller S, et al. Jawetz, Melnick, & Adelberg's Medical Microbiology. 28th ed. McGraw-Hill; 2019.
- Murray PR, Rosenthal KS, Pfaller MA. Medical Microbiology. 9th ed. Elsevier; 2021.
CLSI and Professional Guidelines
- Clinical and Laboratory Standards Institute. Performance Standards for Antimicrobial Susceptibility Testing. CLSI document M100 (verify current edition and institutional adoption).
- Centers for Disease Control and Prevention / NIH. Biosafety in Microbiological and Biomedical Laboratories (BMBL). Current edition (verify institutional adoption).
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