acute diarrhea
occurrence of more than three liquid or very loose bowel movements each day over a period of two days to two weeks
chronic diarrhea
occurrence of more than three liquid or very loose bowel movements each day over a period of two to four weeks or longer
colonization
establishment of microorganisms at a particular site
commensalism
relationship in which one species benefits but the other neither benefits nor is harmed
dental caries
area of permanent tooth decay
duodenal ulcer
open sore or raw area in the inner lining of the upper part (duodenum) of the small intestine
dysentery
condition characterized by severe diarrhea and stomach cramps with blood or mucus in the feces
enterotoxin
toxin released by certain viral and bacterial pathogens that specifically targets the intestines
gastric ulcer
open sore or raw area in the inner lining of the stomach
gastritis
inflammation of the stomach caused by Helicobacter pylori infection, heavy alcohol consumption, or certain medications
Guillain-Barré syndrome (GBS)
disease in which the immune system attacks the peripheral nervous system, often after an episode of stomach flu or respiratory infection
hemolytic uremic syndrome (HUS)
severe illness produced when Shiga toxin from a particularly dangerous strain of E. coli infecting the alimentary canal destroys red blood cells, causing clogging of the kidneys' filtration structures
hepatitis
any of a group of diseases characterized by inflammation of the liver triggered by wide-ranging causative agents
infection
invasion and multiplication of disease-causing organisms within a host’s body
microbiome
typical microorganisms present in an ecosystem
mucus
thick fluid secreted by specialized epithelial cells including those lining the inside of the mouth, stomach, small intestine, and large intestine
mycosis
disease resulting from fungal infection
niche factor
feature enabling commensal and beneficial bacteria to colonize a specific area within a host and evade the host's immune system without damaging the host
pathogenesis
processes involved in the cause and progression of a disease
virulence factor
feature enabling a pathogen to cause disease by releasing toxins, invading host cells and tissues, suppressing the host's immune responses, or otherwise damaging the host