Why Do we Fall Ill — Science STD 9 — Question

Vaccination is when a vaccine is administered to you (usually by injection). Immunisation is what happens in your body after you have the vaccination. The vaccine stimulates your immune system so that it can recognise the disease and protect you from future infection (i.e. you become immune to the infection). ‘Vaccination’ and ‘immunisation’ are often used interchangeably but their meanings are not exactly the same.