A community contains 2000 people. Nobody is initially immune to a disease. A vaccine produces immunity in 90% of recipients. Researchers vaccinate 80% of the community.
Assume there are no infections during vaccination.
How many people are expected to remain susceptible immediately after the immune responses have developed?
160160160
560560560
400400400
144014401440
87 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.