S4.4.4 For the adult
Vaccination
How can a vaccine protect me from a disease I have never had?
What this chapter teaches
A vaccine holds a dead or weakened pathogen, or a part of one, so that white blood cells make antibodies and memory cells before the real pathogen comes. The response is then faster and bigger. Herd immunity means that when enough people are immune, those who cannot be vaccinated are protected too. Vaccines are tested for safety.
Three questions to ask
There is no one right wording. Listen for the idea.
- How does a vaccine prepare the body without causing the disease?
- Why are babies who are too young to be vaccinated safer when most people around them are immune?
- What is a side effect, and what are the common ones for vaccines?
After the chapter, the learner can
- Explain how a vaccine trains the body to respond faster
- Explain how herd immunity protects people who cannot be vaccinated
What they copy into their notebook
A vaccine holds a harmless form of a pathogen. White blood cells make antibodies and memory cells. The real pathogen then meets a fast, big response. Herd immunity protects people who cannot be vaccinated.