Microbial Diseases of the Digestive System

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Chapter 25

• Microbial Diseases of the Digestive System

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Structure and function of the digestive system
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Bacterial diseases of the mouth

• Dental caries

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Bacterial diseases of the mouth

• Dental caries
• Plaque caused by bacteria breaking down sucrose

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Bacterial diseases of the mouth

• Dental caries
• Peridontal disease
• Gingivitis damage to the gingivae or gums
• Periodontitis receding of gums and loss of teeth

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Bacterial diseases of the lower digestive system

• Infection bacteria grow in the intestines
• Onset is 12-24 hours
• Duration is 1-3 days
• Symptoms abdominal cramps, nausea, vomiting,
  fever
• Treatment replace fluids and electrolytes
• Prevention proper handling and preparation of
  food

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Common infections

• Salmonellosis egg and poultry products
• Campylobacter meat products

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Bacterial diseases of the lower digestive system

• Infection
• Intoxication
• Onset is 6-12 hours
• Duration is less than 24 hours
• Symptoms abdominal cramps, nausea, vomiting
• Treatment replace fluids and electrolytes
• Prevention proper storage of foods

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Common intoxications

• Staph food poisoning improperly stored foods

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Other infections

• Typhoid fever invasive organism

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Other infections

• Typhoid fever
• Cholera
• Usually found in water
• Causes profuse diarrhea

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Other infections

• Typhoid fever
• Cholera
• E. coli enteritis
• Invasive organism from animal sources
• Helicobacter pylori
• Associated with most cases of peptic ulcers

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Viral diseases of the digestive system

• Mumps
• Infection of the parotid glands
• Easily spread
• Prevented by MMR vaccine

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Viral diseases of the digestive system

• Mumps
• Hepatitis
• Hepatitis A
• Enters the digestive system and invades tissue
• Half of cases are subclinical
• Vaccine is available
• Hepatitis B
• Can be transmitted by blood transfusion
• Is a problem for health care workers
• Vaccine is available

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Viral diseases of the digestive system

• Hepatitis C
• Transmitted by transfusions
• Can go through genetic variation
• Hard to diagnose
• Symptoms may take years to emerge

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Other diseases

• Fungal diseases
• Ergot poisoning
• Aflatoxin poisoning
• Protozoan diseases
• Giardiasis
• Amoebic dysentery

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Other diseases

• Fungal diseases
• Protozoan diseases
• Helminthic diseases
• Tapeworms
• Ascariasis
• Trichinosis

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