Vaccine

noun (countable); also adjective (archaic)

/vækˈsiːn/

A vaccine is a biological preparation that induces active acquired immunity against a specific pathogen by introducing an antigen — in the form of a weakened or inactivated organism, a subunit protein, a toxoid, or nucleic acid (mRNA) — that stimulates the immune system to produce a memory response without causing the disease. India is the world's largest vaccine manufacturer by volume, producing approximately 60% of global vaccine supply through companies like the Serum Institute of India and Bharat Biotech. India's Universal Immunisation Programme (UIP) provides free vaccines against 12 diseases, including BCG, DPT, measles-rubella, and the indigenously developed rotavirus vaccine ROTAVAC.

✍️ Usage in a UPSC answer

India's Pradhan Mantri Jan Arogya Yojana and the Universal Immunisation Programme collectively represent a multi-tiered public health architecture in which vaccine equity — ensuring the last-mile delivery of immunogens to tribal and remote communities — remains the most operationally complex challenge.

Synonyms

immunogeninoculumantigen preparationprophylacticimmunising agent

Antonyms

pathogenvirulent agentimmunosuppressant

🌱 Word Family

vaccinate (verb), vaccination (noun), vaccinator (noun), vaccinology (noun), unvaccinated (adjective)

🔡 Root

Latin vacca = cow (Edward Jenner's cowpox-derived smallpox vaccine, variolae vaccinae = cow pox)

📜 Etymology

The word derives from Latin vacca (cow), coined by Edward Jenner in 1798 when he published his discovery that inoculation with cowpox (Variolae vaccinae, literally 'cow pox') conferred immunity against smallpox. Louis Pasteur later generalised the term to all immunising preparations in honour of Jenner. This makes 'vaccine' one of the rare scientific terms named after an animal, carrying a permanent reminder of its bovine origin in every language that has adopted it.

🧠 Memory Hook

Vaccine comes from vacca (Latin for cow) — Jenner used COWPOX to prevent smallpox and named his remedy after the cow. So every time you say 'vaccine', you are invoking a cow. Remember: the cow in the word protected humanity from one of history's deadliest diseases.

📝 Seen in UPSC Question Papers

Prelims 2010 — Health
Mains 2022 · GS3 · 15 marks — Science and Technology
Mains 2020 · GS2 · 15 marks — Governance

Real UPSC previous-year questions whose text uses “Vaccine” — proof this word earns its place on your list.

⚗️ General Science 📖 Seen in: Human Body Systems — Organ Systems, Ph...

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