Teacher sheet · Ages 10–11 · about 45–50 minutes
How vaccines work
Lesson page: echoesof.science/school/vaccines/ages-10-11/ · Pupil worksheet: echoesof.science/school/vaccines/ages-10-11/print/
Learning aims
- Describe how a vaccine trains the immune system using antigens, antibodies and memory cells.
- Explain why protection takes time and why some vaccines need several doses.
- Use a fair-test model to explain herd immunity.
Lesson plan
| Time | Activity |
|---|---|
| 5 min | Starter: why do you rarely catch some illnesses twice? |
| 10 min | Read the text; draw a flowchart: vaccine → antigen → antibodies → memory cells. |
| 20 min | Grid experiment, three runs, class means. |
| 5 min | Game: Fact or myth? |
| 5 min | Quiz. |
Materials for the experiment
- A 5 × 5 grid of 25 squares drawn on the board or on paper (one square per 'person')
- Counters in two colours ('vaccinated' and 'caught it')
- A die
- Results table
Safety: This is a paper model. Nobody plays a 'germ' or is labelled as ill, and pupils should not be asked about their own vaccinations.
Common misconceptions
| Pupils may think… | Actually… |
|---|---|
| Vaccines are the same as antibiotics. | Vaccines train the immune system before infection; antibiotics are medicines against bacteria. |
| If you're vaccinated you can never catch the disease. | No vaccine is 100% effective, but vaccinated people are far less likely to become seriously ill. |
| Herd immunity means everyone must be vaccinated. | It means enough people are immune for the disease to stop spreading; the level needed depends on the disease. |
Worksheet answers
- The vaccine contains an antigen (a weakened, killed or harmless part of a germ). White blood cells react to it and make antibodies that recognise that germ. Memory cells stay, so if the real germ comes they respond faster and more strongly.
- One dose often gives only partial protection; repeated doses, weeks or months apart, build stronger and longer-lasting protection.
- Example: run 1 about 25 squares, run 2 about 12, run 3 about 4: the more squares vaccinated, the fewer caught it, because vaccinated squares blocked the paths.
- Real vaccines are not 100% effective; real people move around and meet many others, not just neighbours; some people cannot be vaccinated.
Quiz answers
- What is the active ingredient in a vaccine called? An antigen. The active ingredient in all vaccines is an antigen.[1]
- What do white blood cells make after a vaccine? Antibodies. Antibodies are proteins made by white blood cells.[1]
- Why do some vaccines need more than one dose? One dose often gives only partial protection. Repeated doses build stronger, longer-lasting protection.[1][2]
- How long does it take for protection to build up after a vaccine? Weeks. Immunity can take weeks to develop.[1]
- What is herd immunity? When enough people are immune that a disease cannot spread. Herd immunity also protects people who cannot be vaccinated.[7]
- Who made the first vaccine, against smallpox, in 1796? Edward Jenner. Jenner used material from a cowpox sore.[6]
Going further
Repeat the grid with the 'germ' starting in a corner, or let it jump diagonally too (a more infectious germ). How many must be vaccinated now to stop it?
Sources used in this lesson
- [1] Explaining How Vaccines Work (Centers for Disease Control and Prevention (USA)): reliability High
- [2] How do vaccines work? (World Health Organization): reliability High
- [3] Why vaccination is important and the safest way to protect yourself (NHS (UK National Health Service)): reliability High
- [6] History of smallpox vaccination (World Health Organization): reliability High
- [7] What is herd immunity? (The Royal Society (UK)): reliability High
Full list with links and a note on each source's reliability: echoesof.science/school/vaccines/sources/
Privacy: the lesson pages have no ads, no tracking and no cookies. Quiz answers and game scores stay in the pupil's browser. A short video for each age is coming.