Peptic Ulcer - An open sore that develops on the inner lining of the stomach or upper small intestine.⏎
Protozoa - A taxonomic group of single-celled microorganisms that live in almost every kind of habitat and include some pathogenic parasites of humans and other animals. ⏎
Protein - Large molecules composed of one or more chains of amino acids in a specific order determined by the base sequence of nucleotides in the DNA coding.⏎
Reservoir - An organism in which a parasite that is pathogenic for some other organism lives and reproduces without harming its host.⏎
Nanometer - A unit of length equal to one one-billionth (1 x 10-9) of a meter.⏎