A small group of people who are resistant to infection by HIV appear to have this resistance because they are homozygous for a non-functional variant of a specific immune-system protein. How does this prevent HIV from infecting them?

MCQs on the immune system, including innate and adaptive immunity, the cells involved in each of process of the immune system and their role in the immune response, and how antibodies are used to confer immunity for future potential exposures.