Ch 25 Microbial diseases of the digestive system Flashcards
1
Q
Millions of bacteria per ml of saliva 700 species in mouth Large numbers in large intestine 100 billion bacteria per gram of feces Defenses Stomach acid Small intestine: Paneth cells phagocytes Defensins lysozyme
A
normal microflora
2
Q
Diseases of Lower Digestive System
A
Infection: Growth of a pathogen Incubation is from 12 hours to 2 weeks Fever Intoxication: Ingestion of toxin Symptoms appear 1 to 48 hours after ingestion Gastroenteritis: Diarrhea, dysentery Treatment: Oral rehydration therapy
3
Q
Caused by Salmonella typhi
Bacteria spread throughout body in phagocytes
1–3% of recovered patients become chronic carriers
A
Typhoid Fever
4
Q
Vibrio cholerae serotypes, O:1, O:139, that produce cholera toxin
Toxin causes host cells to secrete Cl–, HCO–, and water
Usually from contaminated crustaceans or mollusks
V. parahaemolyticus
V. vulnificus
A
Cholera
Noncholera vibrios
5
Q
Escherichia coli Gastroenteritis
A
Pathogenic E. coli
Attach to intestinal cells with fimbriae
Produce toxins
May aggregate
