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Across 6. The administration of antigenic material (a vaccine) to stimulate an individual's immune system to develop adaptiveimmunity to a pathogen. 7. An inflammatory condition of the lung affecting primarily the microscopic air sacs known as alveoli. 8. A small infectious agent that replicates only inside the living cells of other organisms. 9. An agent that either kills or inhibits the growth of a microorganism.

Down 1. The invasion of a host organism's bodily tissues by disease-causing organisms. 2. Substances that are applied to non-living objects to destroy microorganisms that are living on the objects. 3. Any substance which provokes an adaptive immune response. 4. A state of physical and/or mental weakness. 5. A temporary prevalence of a disease.