International A Level Biology / Immunity

Natural, artificial, active and passive immunity revision notes

Edexcel International A Level Biology (YBI11), chapter 18: Immunity, specification point 6.11. Part of the full course.

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Immunity can be active or passive, and natural or artificial. These differences explain how quickly protection begins, how long it lasts, and how vaccines protect you without causing the disease.

More lessons in Immunity

• Non-specific responses: inflammation, lysozyme and interferon
• Phagocytosis
• Antigens, antibodies and antigen-presenting cells
• The specific response: B cells and antibodies
• The specific response: T helper, T killer and T memory cells
• The evolutionary race between pathogens and hosts
• Antibiotics: bacteriostatic and bactericidal
• Core practical 14: the effect of antibiotics on bacteria
• Antibiotic resistance and hospital-acquired infections