autoimmune diseases: Illnesses that occur when the body's immune system attacks its own tissues.

biological weapons: Bacteria, viruses, or toxic substances produced by living organisms, used to intentionally harm plants, animals, or humans.

capsule: A gel or slime layer that covers the surface of some bacteria; when present on disease-causing organisms, it makes them more deadly.

edema: Swelling caused by an abnormal accumulation of fluid in the body tissues.

enzyme: A protein molecule that assists and speeds up chemical reactions.

fluorescence: The emission of light from a substance in response to radiation (such as light) from an outside source.

formaldehyde: A chemical substance used as an antiseptic, disinfectant, and preservative for living tissues.

germinate: To sprout or begin to grow.

immune system: The body system that defends the body against infection, disease, and foreign substances.

nonvirulent microorganisms: Organisms that are unable to cause disease or injury.

septicemia: A...