Special Topic 2 – Virus & Biotechnology
mRNA Vaccines & Immunology (Page 2)

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How Does the Immune System Work?

The immune system protects the body against infections caused by viruses and bacteria. It consists of two main components:

• Innate Immunity: Immediate, non-specific defense mechanism.
• Adaptive Immunity: Specific response involving antibodies and memory cells.

When a virus enters the body, immune cells recognize foreign antigens and produce antibodies to neutralize them.

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 What are mRNA Vaccines?

mRNA vaccines use messenger RNA to instruct cells to produce a harmless viral protein. This protein triggers an immune response without causing the disease.

• Do not use live virus
• Faster development compared to traditional vaccines
• Enable rapid response during pandemics

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 Advantages of mRNA Technology

• Quick design and manufacturing
• High efficacy
• Potential use in cancer therapy
• Flexible platform for multiple diseases

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Challenges

• Cold storage requirements
• High production cost
• Public hesitancy and misinformation
• Need for long-term safety data

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📚 Exam Relevance

• COVID-19 Vaccine Development
• Biotechnology advancements
• Public Health Policy
• Global Health Governance

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 Scientific Insight:

Vaccines do not weaken the immune system — they train it for future defense.

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