Are all mycobacteria dangerous?

No. While some species like Mycobacterium tuberculosis and Mycobacterium leprae are major human pathogens, many mycobacteria are harmless environmental saprophytes.

Why is it hard to treat mycobacterial infections?

The unique, waxy mycolic acid cell wall acts as a barrier, making mycobacteria naturally resistant to many common antibiotics and disinfectants.

What does 'acid-fast' mean in relation to mycobacteria?

It refers to a special staining property. Due to their waxy walls, mycobacteria retain dye even when washed with acid, which helps identify them under a microscope.

Is 'mycobacteria' singular or plural?

It is the plural form. The singular form is 'mycobacterium'. A common mistake is to say 'a mycobacteria' instead of 'a mycobacterium'.

mycobacteria

UK/ˌmaɪ.kəʊ.bækˈtɪə.ri.ə/US/ˌmaɪ.koʊ.bækˈtɪr.i.ə/

Technical/Academic/Medical

My Flashcards

Definition

Meaning

A genus of bacteria characterized by a waxy coating on their cell walls, making them resistant to many antibiotics and staining techniques.

Rod-shaped aerobic bacteria, some of which are significant pathogens causing diseases like tuberculosis and leprosy in humans and animals, while others are harmless saprophytes found in various environments.

Linguistics

Semantic Notes

Primarily used in the plural form (mycobacteria) as it refers to a genus or group. The singular 'mycobacterium' is less common but used when referring to a single organism. The term is almost exclusively used in microbiology, medicine, and public health contexts.

Dialectal Variation

British vs American Usage

Differences

No significant lexical differences. Both varieties use the same term with the same spelling. Pronunciation differences are minimal and follow general UK/US patterns for scientific Latin-derived terms.

Connotations

Identical strong association with serious diseases (TB, leprosy) and laboratory diagnostics in both varieties.

Frequency

Equally low-frequency in general discourse but standard in medical/scientific contexts in both regions.

Vocabulary

Collocations

strong

acid-fast mycobacterianontuberculous mycobacteriamycobacteria speciesatypical mycobacteriamycobacteria culturemycobacteria growth

medium

detect mycobacteriaisolate mycobacteriapathogenic mycobacteriaenvironmental mycobacteriaresistant mycobacteria

weak

study of mycobacteriapresence of mycobacteriavarious mycobacteriacertain mycobacteria

Grammar

Valency Patterns

Mycobacteria [verb: cause, infect, resist, grow][Adjective: pathogenic, environmental] mycobacteriaMycobacteria of [type/disease]Infection with mycobacteria

Vocabulary

Synonyms

Neutral

acid-fast bacillimycobacterial organisms

Weak

TB bacteria (context-specific)rod-shaped bacteria (broader category)

Vocabulary

Antonyms

gram-positive coccigram-negative bacilli (in terms of staining classification)

Usage

Context Usage

Business

Not used.

Academic

Core term in microbiology, medicine, and public health research. E.g., 'The study focused on the antibiotic resistance mechanisms of environmental mycobacteria.'

Everyday

Virtually never used in casual conversation except in discussions of specific diagnoses like tuberculosis.

Technical

Essential term in medical laboratories, clinical diagnostics, and epidemiological reports. E.g., 'The sputum sample was positive for mycobacteria on culture.'

Examples

By Part of Speech

verb

British English

The sample was sent to the lab to be tested for mycobacteria.

American English

The lab will culture the tissue to see if it mycobacteriaes. (Note: 'Mycobacteria' is not used as a verb. This demonstrates its lack of verb form.)

adjective

British English

The patient has a mycobacterial infection.

American English

Mycobacterial diseases require long-term treatment.

Examples

By CEFR Level

Tuberculosis is caused by mycobacteria.

Some mycobacteria found in water systems can cause lung infections.

The differential diagnosis included infection with nontuberculous mycobacteria, given the patient's negative PCR for M. tuberculosis.

Learning

Memory Aids

Mnemonic

Think: 'MY COat BACTERIA' – these bacteria have a MY (mycolic acid) COat that makes them tough.

Conceptual Metaphor

Often conceptualized as a 'stealthy invader' due to its slow growth and ability to persist inside host cells undetected.

Watch out

Common Pitfalls

Translation Traps (for Russian speakers)

The Russian term 'микобактерии' is a direct cognate, so no translation trap exists. However, students might mistakenly associate 'myco-' (fungus) with грибки, but it refers to the fungus-like appearance of the bacterial colonies, not the organism itself.

Common Mistakes

Mispronunciation: stressing the wrong syllable (e.g., MY-co-bac-TER-ia). Correct stress is on 'ter'.
Using as a singular countable noun ('a mycobacteria') instead of the correct singular 'a mycobacterium'.
Misspelling as 'mycobacterria' or 'mycobactria'.

Practice

Quiz

Fill in the gap

Laboratory tests confirmed the presence of in the tissue sample, indicating an atypical infection.

Multiple Choice

What is a defining characteristic of mycobacteria?

FAQ

Frequently Asked Questions

: No. While some species like Mycobacterium tuberculosis and Mycobacterium leprae are major human pathogens, many mycobacteria are harmless environmental saprophytes.
: The unique, waxy mycolic acid cell wall acts as a barrier, making mycobacteria naturally resistant to many common antibiotics and disinfectants.
: It refers to a special staining property. Due to their waxy walls, mycobacteria retain dye even when washed with acid, which helps identify them under a microscope.
: It is the plural form. The singular form is 'mycobacterium'. A common mistake is to say 'a mycobacteria' instead of 'a mycobacterium'.