A newly developed vaccine for a highly contagious respiratory virus, ‘Respi-X’, has shown promising results in clinical trials. However, due to production limitations and distribution challenges, initial vaccination efforts will be focused on specific subgroups within the population. Health authorities are considering two primary strategies:
b. Based on the information provided, and assuming both strategies achieve their target vaccination coverage of 20% of the population, evaluate which strategy is more likely to effectively reduce the $R_0$ (basic reproduction number) of Respi-X and move the population closer to achieving herd immunity. Justify your answer.
Marking your answer...
This may take a few seconds
Sign up for free to see your full marking breakdown and personalised study recommendations.
Create Free Account Log inThis is a free VCE Units 3 & 4 Biology practice question worth 4 marks, testing your understanding of Vaccines & herd immunity. It falls under How do organisms respond to pathogens? in Unit 4: How does life change and respond to challenges?. Submit your answer above to receive instant AI-powered marking and personalised feedback.
In this unit students consider the continual change and challenges to which life on Earth has been, and continues to be, subjected. They study the human immune system and the interactions between its components to provide immunity to a specific pathogen. Students consider how the application of biological knowledge can be used to respond to bioethical issues and challenges related to disease. Students consider how evolutionary biology is based on the accumulation of evidence over time. They investigate the impact of various change events on a population’s gene pool and the biological consequences of changes in allele frequencies. Students examine the evidence for relatedness between species and change in life forms over time using evidence from paleontology, structural morphology, molecular homology and comparative genomics. Students examine the evidence for structural trends in the human fossil record, recognising that interpretations can be contested, refined or replaced when challenged by new evidence. Students demonstrate and apply their knowledge of how life changes and responds to challenges through investigation of a selected case study, data analysis and/or bioethical issue. Examples of investigation topics include, but are not limited to: deviant cell behaviour and links to disease; autoimmune diseases; allergic reactions; development of immunotherapy strategies; use and application of bacteriophage therapy; prevention and eradication of disease; vaccinations; bioprospecting for new medical treatments; trends, patterns and evidence for evolutionary relationships; population and species changes over time in non-animal communities such as forests and microbiota; monitoring of gene pools for conservation planning; role of selective breeding programs in conservation of endangered species; or impact of new technologies on the study of evolutionary biology. A student-designed scientific investigation involving the generation of primary data related to cellular processes and/or how life changes and responds to challenges is undertaken in either Unit 3 or Unit 4, or across both Units 3 and 4, and is assessed in this unit, Outcome 3. The design, analysis and findings of the investigation are presented in a scientific poster format as outlined in the study design.
In this area of study students focus on the immune response of organisms to specific pathogens. Students examine unique molecules called antigens and how they illicit an immune response, the nature of immunity and the role of vaccinations in providing immunity. They explain how technological advances assist in managing immune system disorders and how immunotherapies can be applied to the treatment of other diseases. Students consider that in a globally connected world there are biological challenges that can be mediated by identification of pathogens, the prevention of spread and the development of treatments for diseases.
vaccination programs and their role in maintaining herd immunity for a specific disease in a human population
All free, all instant AI marking.
Define herd immunity and explain how a vaccination program can establish and maintain herd immunity for influenza in a human population.
In 2023, a newly discovered virus, 'Rona-23', emerged with a high transmission rate among primary school-aged children. Health authorities p…
The island of Tasmanar is home to a unique marsupial species, the Tasmanar quoll. A highly contagious and virulent virus, Quoll Pox, emerges…
A remote island population of 5000 people experiences an outbreak of a novel influenza virus. Initially, only 50 individuals are infected. A…
A hypothetical population of wallabies is susceptible to a newly identified virus, 'Wallaby Pox'. Scientists estimate that the basic reprodu…
Which of the following best describes the primary role of vaccination programs in achieving herd immunity within a population?
StudyPulse has thousands of VCE Biology questions with full AI feedback, mark breakdowns, progress tracking, and study notes across every Key Knowledge point including Vaccines & herd immunity.
