This exam tips covers Exam Tips: Vaccination and Herd Immunity within Vaccination and Herd Immunity for GCSE Biology. How vaccines work, types of vaccines, population immunity, vaccination programs It is section 8 of 15 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Exam Tips: Vaccination and Herd Immunity
Memory Formation Questions
Link vaccination to adaptive immunity topics:
- Antigen presentation → B cell activation → antibody production
- Memory B cells formed during primary response
- Secondary response faster and stronger upon pathogen exposure
- Memory cells provide long-term immunity
Herd Immunity Calculations
Practice threshold calculations:
- Formula: Threshold = 1 - (1/R₀)
- Higher R₀ = more contagious = higher threshold needed
- Measles (R₀=15) needs 93% coverage
- Influenza (R₀=2) needs 50% coverage
Vaccine Types Comparison
Remember key differences:
- Live attenuated: Strong immunity but risk for immunocompromised
- Inactivated: Safer but may need boosters
- Subunit: Very safe, specific targeting
- Consider advantages/disadvantages for each type
Ethical and Social Issues
Be prepared to discuss:
- Individual choice vs. community benefit
- Protecting vulnerable populations
- Risk-benefit analysis of vaccination
- Role of scientific evidence in public health policy
Data Analysis Skills
Practice interpreting graphs showing:
- Disease incidence before/after vaccination programs
- Vaccination coverage rates over time
- Correlation between coverage and disease outbreaks
- Age-specific vaccination schedules
Practice questions for Vaccination and Herd Immunity
What do vaccines contain?
Explain how vaccination protects a person from getting a disease. [3 marks]
Quick recall flashcards
Why don't vaccines cause the disease they protect against?
Vaccines use dead or inactive pathogens, or just antigens from the pathogen's surface.
The pathogen cannot multiply or cause infection.
The immune system still recognises the antigens and builds immunity.
What is a vaccine and how does it work?
A vaccine contains a dead or weakened form of a pathogen (or its antigens).
It triggers the immune system to produce antibodies and memory cells without causing disease.
If the real pathogen enters later, memory cells respond rapidly.