mycobacterium
C2Technical/Scientific
Definition
Meaning
A genus of rod-shaped, often pathogenic bacteria characterized by a waxy cell wall, causing diseases like tuberculosis and leprosy.
Any bacterium belonging to the genus Mycobacterium; in scientific contexts, often used to refer to pathogenic species and their complex growth requirements or staining characteristics.
Linguistics
Semantic Notes
The term is almost exclusively used in medical, microbiological, and public health contexts. It typically refers to the genus as a whole or specific pathogenic species (e.g., M. tuberculosis). The 'myco-' prefix can be misleading, as it derives from the fungus-like appearance of some colonies, not a biological relationship to fungi.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Spelling and pronunciation follow standard national patterns.
Connotations
Identical technical connotations in both varieties.
Frequency
Equally rare outside specialised fields in both regions.
Vocabulary
Collocations
Grammar
Valency Patterns
The [SPECIES] mycobacterium causes [DISEASE].[DISEASE] is caused by a mycobacterium.To culture/culture a mycobacterium from [SAMPLE].Vocabulary
Synonyms
Neutral
Weak
Usage
Context Usage
Business
Not used.
Academic
Core term in microbiology, medicine, epidemiology, and public health research.
Everyday
Virtually never used in everyday conversation. Might appear in news reports about tuberculosis outbreaks or antibiotic resistance.
Technical
The primary context. Used in lab reports, medical diagnoses, clinical guidelines, and scientific literature.
Examples
By Part of Speech
verb
British English
- The sample was sent to the lab to be cultured for mycobacterium.
- They are attempting to mycobacteri... (No standard verb form exists).
American English
- The lab will process the sputum to culture for mycobacterium.
- Researchers aim to mycobacteri... (No standard verb form exists).
adverb
British English
- The stain reacted mycobacterially... (No standard adverb form exists).
American English
- The sample tested positive, indicating a mycobacterially caused... (No standard adverb form exists).
adjective
British English
- The patient has a mycobacterial infection.
- Mycobacterial cultures require special media.
American English
- She was diagnosed with a mycobacterial disease.
- The lab follows mycobacterial testing protocols.
Examples
By CEFR Level
- Tuberculosis is caused by a mycobacterium.
- The doctor explained that the lung infection was due to a non-tuberculous mycobacterium, which is harder to treat.
- Mycobacteria have unique cell walls that make them resistant to many common antibiotics.
- The study focused on the genomic diversity of environmental mycobacteria isolated from urban water systems.
- Diagnosis of mycobacterium avium complex (MAC) requires both clinical symptoms and positive culture results from sterile sites.
Learning
Memory Aids
Mnemonic
Think: 'MY COat has BACTERIA' - MYCObacteria have a waxy 'coat' (cell wall) and are a type of bacteria.
Conceptual Metaphor
The bacterium is often conceptualised as a 'stubborn intruder' due to its resilient cell wall and persistent infections.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with general terms for bacteria like 'бактерия' or 'микроб'. The precise equivalent is 'микобактерия'.
- The 'myco-' part is unrelated to fungi ('грибок'), so avoid calquing it as 'грибковая бактерия'.
Common Mistakes
- Mispronouncing it as 'myco-bacterium' with equal stress on all syllables.
- Incorrect plural: 'mycobacterias' (correct: 'mycobacteria').
- Using it as a general term for any bacteria.
Practice
Quiz
What is a defining characteristic of mycobacteria?
FAQ
Frequently Asked Questions
It is singular. The plural form is 'mycobacteria'.
No. Many mycobacteria are environmental saprophytes and non-pathogenic. Only certain species, like M. tuberculosis and M. leprae, are major human pathogens.
The name comes from the Greek 'mykes' (fungus) because some species form mould-like pellicles when grown in liquid culture, giving a fungus-like appearance.
It refers to a staining property. Due to their waxy cell wall, mycobacteria retain dye even when washed with acid-alcohol, making them visible under a microscope in diagnostic tests like the Ziehl-Neelsen stain.