Peptic Ulcer - An open sore that develops on the inner lining of the stomach or upper small intestine.⏎
Pathogen - A biological agent that causes disease.⏎
Nanometer - A unit of length equal to one one-billionth (1 x 10-9) of a meter.⏎
Rheumatic Fever - An inflammatory disease that may be caused by an untreated or improperly treated case of strep throat.⏎
Reservoir - An organism in which a parasite that is pathogenic for some other organism lives and reproduces without harming its host.⏎