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This lesson covers vaccination as required by the Edexcel GCSE Combined Science specification (1SC0). You need to understand how vaccines work, the concept of herd immunity, the benefits and risks of vaccination, and the process of vaccine development.
Vaccination is a method of preventing disease by introducing a weakened, inactive or dead form of a pathogen (or parts of it) into the body. This stimulates the immune system to produce antibodies and memory cells without causing the disease.
A vaccine is the substance that is administered (usually by injection, but sometimes orally or as a nasal spray).
Vaccines exploit the body's natural immune response, specifically the formation of memory cells:
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