BIOL 3053 Lecture Notes - Lecture 12: Gastrointestinal Tract, Gastroenteritis, Sewage Treatment
12 Apr 2016
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Topic 12: microbial diseases of the digestive system. Usually result from ingestion of microorganisms or their toxins from food or water. Two types: (v. imp: infections- when a pathogen enters gi tract and mutiples. Incubation period 12 hrs to 2 weeks. Pathogens can penetrate intestinal mucosa and grow, or can pass to other systemic organs. Some can produce toxins inside body: contribute to disease symptom development: intoxication- caused by ingestion of a preformed toxin. Sudden onset of symptoms (within a few hours) Both infections and intoxications often cause gastroenteritis (inflammation of stomach and intestinal mucosa) Both are mainly treated with ort, antibiotics only in some instances. 1 x 106 bacteria/ g food to make enough toxin to cause illness. Foods with high [sugar] or high [salt] e. g. cusrads, cream pies, ham* Prevention*: adequate refrigeration during food storage, proper personal hygiene during food handling. Normally found in intestinal tract of humans and other animals.
