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MCB 2010_ Microbiology Lecture Final Exam Ch. 20
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- Microbiology Ivy Tech BIOL201
MCB 2010_ Microbiology Lecture Final Exam Ch. 20
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MCB 2010: Microbiology Lecture FinalExam Ch. 20
Defenses of the Digestive Tracts - ANS-- All intestinal surfaces are coated with mucus
- Secretory IgA
- Peristalsis
- Saliva contains lysozyme and lactoferrin
- Stomach is highly acidic
- Bile is antimicrobial
- Gut-associated lymphoid tissue
Bacteria of the Mouth - ANS-Pellicle - From saliva
Bacteria - Dextran and lactic acid
Dental Plaque
>550 species
- Streptococcus mutans
- Actinomyces spp.
- Candida albicans
- Trichomonas tenax
- Entamoeba gingivalis
Digestive Tract Normal Biota - ANS-Large numbers in large intestine
- MORE THAN 500 different species
Examples:
Bacteroides, Bifidobacterium, Clostridium, Streptococcus, Lactobacillus, Escherichia,
Enterococcus and Enterobacter
Bacterial Disease of the Mouth - ANS-Dental caries - tooth decay
Streptococcus mutans
Gingivitis - gum inflammation (gums bleed during brushing)
Acute necrotizing gingivitis - Prevotella intermedia
, Periodontitis - Inflammation and infections of the ligaments and bones that support the
teeth
Porphyromonas spp.
Diseases of Lower Digestive Tract - ANS-Infection
- Growth of a pathogen
- Fever
Intoxication
- Ingestion of toxin
Gastroenteritis
- Diarrhea, dysentery
Dysentery - Inflammatory disorder, diarrhea containing mucus and/or blood
Treatment = Oral Rehydration Therapy
Acute Diarrheal Infections - ANS-Diarrhea
- > 3 loose stools in a 24-hour period
- Often accompanied by fever, abdominal pain, cramping, nausea, vomiting, and
dehydration
- Most episodes are self-limiting
Bacterial
- Salmonella
- Shigella
- E. coli O157:H7
- Campylobacter
- Clostridium difficile
- Vibrio cholerae
Protozoan
- Cryptosporidium
Viral
- Rotavirus
Salmonella - ANS-Bacteria - Salmonellosis
- S. enteritica, S. paratyphi, S. hirschfeldii, S. typhimurium, Arizona hinshawii (reptiles)
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