active immunity
C1Technical/Scientific, Academic
Definition
Meaning
The long-term immune protection an individual's own body produces after exposure to a pathogen or a vaccine.
In immunology, this refers to the adaptive immune response that involves the production of antibodies and memory cells, providing lasting, specific protection against a particular disease. It contrasts with passive immunity, which involves receiving antibodies from another source.
Linguistics
Semantic Notes
A highly technical term in medicine and biology. It is a hyponym (subtype) of 'immunity'. It inherently contrasts with 'passive immunity'. Its meaning is precise and not used metaphorically in general contexts.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning, spelling, or application. Standard in both medical lexicons.
Connotations
None beyond the technical definition.
Frequency
Used with equal frequency and formality in medical/academic contexts in both regions.
Vocabulary
Collocations
Grammar
Valency Patterns
develop active immunity to [disease]active immunity against [pathogen] is acquired through [exposure/vaccination]vaccination confers active immunityVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “This term is not used idiomatically.”
Usage
Context Usage
Business
Not used.
Academic
Core term in medical, biological, and public health texts, e.g., 'The study measured the active immunity elicited by the new vaccine.'
Everyday
Rarely used. In general health discussions, simpler terms like 'your body's own protection' or 'vaccine protection' are preferred.
Technical
The primary context. Used precisely to describe the body's endogenous immune response following antigen exposure.
Examples
By Part of Speech
verb
British English
- The patient's body will actively immunise itself after infection.
- The vaccine programme aims to immunise the population actively.
American English
- The patient's body will actively immunize itself after infection.
- The vaccine program aims to immunize the population actively.
adverb
British English
- The immunity was acquired actively, not passively.
- The system responded actively to the challenge.
American English
- The immunity was acquired actively, not passively.
- The system responded actively to the challenge.
adjective
British English
- The vaccine triggers an active immune response.
- We are studying active immunisation pathways.
American English
- The vaccine triggers an active immune response.
- We are studying active immunization pathways.
Examples
By CEFR Level
- Vaccines help your body build active immunity.
- If you get chickenpox, you usually develop active immunity and won't get it again.
- Active immunity results from the body's production of its own antibodies following exposure to an antigen, either through infection or vaccination.
- Unlike the temporary protection of passive immunity, active immunity can last for many years or even a lifetime.
- The new subunit vaccine was designed to elicit robust active immunity by presenting key viral antigens without the risk of live infection.
- Public health strategies prioritise inducing active immunity in populations to achieve herd immunity and interrupt disease transmission chains.
Learning
Memory Aids
Mnemonic
Think ACTIVE = your immune system is actively working to create its OWN defenses.
Conceptual Metaphor
IMMUNITY IS A SHIELD (that your own body forges).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid direct translation that implies 'активный иммунитет' as 'energetic immunity'. The English term is a fixed scientific collocation referring to the origin (self-produced) of the immunity.
- Do not confuse with 'innate immunity' (врождённый иммунитет). 'Active immunity' is acquired.
Common Mistakes
- Using 'active immunity' to describe a person who is rarely sick (that describes general health, not the immunological term).
- Confusing it with 'innate immunity'.
- Spelling 'imunity'.
- Using it in non-scientific contexts where it sounds overly technical.
Practice
Quiz
Which scenario best illustrates the development of active immunity?
FAQ
Frequently Asked Questions
Active immunity is produced by the individual's own immune system and is long-lasting. Passive immunity involves receiving antibodies from an external source (like maternal antibodies or an antitoxin) and is temporary.
Through natural infection or through vaccination. Both expose the immune system to an antigen, prompting it to create memory cells and antibodies.
No, it cannot be transferred. It is specific to the individual whose immune system generated the response. Only the products of immunity (antibodies) can be transferred, which constitutes passive immunity.
Herd immunity is a population-level concept. It is achieved when a high percentage of individuals in a community have active immunity (typically from vaccination), indirectly protecting those who are not immune.