A girl caught chickenpox and was ill for a week. Her brother was given a vaccine against chickenpox.
Two years later, both children were exposed to chickenpox again. Neither child became ill.
Compare how the girl and her brother became immune to chickenpox.
While she had chickenpox, the girl also developed a bacterial infection in her skin.
Explain why the doctor gave her an antibiotic for the skin infection but not for the chickenpox.
45 exam-style questions on Edexcel GCSE Biology 5.3 Immune system and medicines, covering 5.3.1 The specific immune system, 5.3.2 Response to immunisation, 5.3.3 Advantages and disadvantages of immunisation, 5.3.4 Antibiotics and bacterial infections, 5.3.5 Aseptic techniques in culturing, 5.3.6 Cross-sectional areas of cultures, 5.3.7 Stages of developing new medicines, and 5.3.8 Production of monoclonal antibodies. Each one has a worked solution and a mark scheme showing where the marks go.