Across
- 3. resistance to the spread of an infectious disease within a population that is based on pre-existing immunity of a high proportion of individuals as a result of previous infection or vaccination
- 5. a substance used to stimulate immunity to a particular infectious disease or pathogen
- 7. a toxin or other foreign substance that induces an immune response in the body, especially the production of antibodies
Down
- 1. bacterium, viruses, or other microorganisms that can cause disease
- 2. the ability of the immune system to respond more rapidly and effectively to pathogens that have been encountered previously
- 4. a complex network of organs, cells and proteins that defends the body against infection, whilst protecting the body's own cells
- 6. destroy disease-causing organisms (such as viruses or bacteria) and block them from infecting human cells