Worked solution
Considering how immunisation works, a vaccine introduces a small, carefully controlled and safe amount of a weakened, inactive, or partial form of a disease-causing organism into the body; this is not enough to cause the actual disease, but it is enough to trigger the body's immune system to respond as though it were fighting a real infection, producing antibodies specific to that disease. Because the immune system 'remembers' this response, if the child is later exposed to the real disease, their body can recognise it quickly and produce antibodies rapidly, often preventing the child from becoming seriously ill, or reducing the severity of the illness if they do catch it. Considering the importance of immunisation, at an individual level it protects the child directly from potentially serious, and in some cases life-threatening, infectious diseases, such as measles, whooping cough and meningitis, all of which can cause serious complications, particularly in young children; at a wider, community level, when a high proportion of the population is immunised, it becomes much harder for a disease to spread through the population at all, a protective effect known as herd immunity, which is particularly important for protecting people who cannot be vaccinated themselves, such as very young babies who are not yet old enough for certain vaccines, or people with certain medical conditions. Considering concerns parents may have, some parents worry about possible side effects or reactions to a vaccine, and some may have encountered misinformation online or elsewhere that makes them hesitant or anxious about vaccinating their child; it is therefore important to acknowledge that these concerns are genuinely held by some parents, even though, in reality, serious side effects from modern, well-tested vaccines are rare, and the diseases that immunisation protects against are typically far more dangerous to a child's health than the vaccine itself, meaning that, for the great majority of children, the benefits of immunisation substantially outweigh the risks. Weighing this evidence together, immunisation is an important and highly effective way of protecting both individual children and the wider community from serious infectious disease, and while parental concerns about side effects should be taken seriously and addressed with clear, accurate information, they do not, on the current evidence, outweigh the substantial protective benefits that immunisation provides. Answer: immunisation works by triggering the immune system to produce antibodies using a safe, weakened form of a disease, so the body can fight the real disease more effectively in future; it is important both for protecting the individual child from serious illness and for herd immunity protecting the wider community, and while some parents have genuine concerns about side effects, these are rare, and the protective benefits are judged to substantially outweigh the risks.
Marking scheme
Level-of-response marking, maximum [9]. Level 3 (7-9 marks/Highly Competent): comprehensive, accurate explanation of how immunisation works, a clear discussion of its importance at both individual and community level, and genuine engagement with parental concerns, with a balanced overall judgement, accurate specialist vocabulary, high standard of quality of written communication. Level 2 (4-6 marks/Competent): good knowledge of how immunisation works and/or its importance, competent quality of written communication; capped at a maximum of 5 marks if only one aspect (e.g. how it works, OR importance, OR concerns) is addressed, with the others omitted. Level 1 (1-3 marks/Basic): limited points, basic quality of written communication. 0 marks: no creditable response.