streptolysin: meaning, definition, pronunciation and examples
Very lowSpecialized/Technical
Quick answer
What does “streptolysin” mean?
An exotoxin, typically a haemolysin, produced by bacteria of the genus Streptococcus that causes the lysis (destruction) of red blood cells.
Audio
Pronunciation
Definition
Meaning and Definition
An exotoxin, typically a haemolysin, produced by bacteria of the genus Streptococcus that causes the lysis (destruction) of red blood cells.
In immunology and microbiology, streptolysins (O and S) are specific cytolytic toxins key to streptococcal pathogenesis, used as diagnostic markers (e.g., Anti-Streptolysin O test for rheumatic fever).
Dialectal Variation
British vs American Usage
Differences
No significant lexical or grammatical differences. Spelling and usage are identical.
Connotations
Purely technical, scientific term with no cultural connotations in either variety.
Frequency
Equally rare and specialized in both varieties, used only in professional medical and scientific contexts.
Grammar
How to Use “streptolysin” in a Sentence
The bacteria secrete streptolysin.Streptolysin is produced by Streptococcus pyogenes.Antibodies target streptolysin.The test measures antibodies to streptolysin.Vocabulary
Collocations
Examples
Examples of “streptolysin” in a Sentence
adjective
British English
- The streptolysin activity was measured.
- A streptolysin-mediated effect was observed.
American English
- The streptolysin activity was measured.
- A streptolysin-mediated effect was observed.
Usage
Meaning in Context
Business
Not used.
Academic
Used exclusively in medical, microbiological, and immunological research papers and textbooks.
Everyday
Never used in everyday conversation.
Technical
Core term in clinical diagnostics (ASO titre), bacteriology, and pathogenesis studies.
Vocabulary
Synonyms of “streptolysin”
Neutral
Weak
Vocabulary
Antonyms of “streptolysin”
Watch out
Common Mistakes When Using “streptolysin”
- Misspelling as 'streptolysine' (adding an extra 'e').
- Incorrect pronunciation placing primary stress on the first syllable (STREP-to-lysin) instead of the third (strep-to-LY-sin).
- Using it as a general term for any bacterial toxin.
FAQ
Frequently Asked Questions
Streptolysin O (SLO) is oxygen-labile, antigenic, and used diagnostically. Streptolysin S (SLS) is oxygen-stable, non-antigenic, and directly responsible for the beta-haemolysis seen on blood agar plates.
No, it is a highly specialized term used almost exclusively in medicine, clinical pathology, and microbiology. The average English speaker will never encounter it.
No. It is exclusively a noun. Related verbs would be 'lyse' or 'haemolyse'.
It detects antibodies against SLO, serving as evidence of a recent Streptococcus pyogenes infection. This is crucial for diagnosing post-streptococcal sequelae like rheumatic fever or glomerulonephritis.
An exotoxin, typically a haemolysin, produced by bacteria of the genus Streptococcus that causes the lysis (destruction) of red blood cells.
Streptolysin is usually specialized/technical in register.
Streptolysin: in British English it is pronounced /ˌstrɛptəʊˈlaɪsɪn/, and in American English it is pronounced /ˌstrɛptoʊˈlaɪsɪn/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think: STREPTOcoccus + LYSe (to break apart) + -IN (a substance) = a substance from strep that breaks cells apart.
Practice
Quiz
What is the primary biological action of streptolysin?