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Epidemiology and Management of Diarrheal Diseases Amal Mitra, MD, MPH, DrPH Professor University of Southern Mississippi Readings: Diarrhoeal DiseasesDiarrhoeal.

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Presentation on theme: "Epidemiology and Management of Diarrheal Diseases Amal Mitra, MD, MPH, DrPH Professor University of Southern Mississippi Readings: Diarrhoeal DiseasesDiarrhoeal."— Presentation transcript:

1 Epidemiology and Management of Diarrheal Diseases Amal Mitra, MD, MPH, DrPH Professor University of Southern Mississippi Readings: Diarrhoeal DiseasesDiarrhoeal Diseases

2 DEFINITION Watery Diarrhea: 3 or more liquid or watery stools in 24 h Dysentery: Presence of blood and/or mucus in stools Persistent Diarrhea: Diarrhea lasting for 14 days or more


4 COMMON CAUSES OF DIARRHEA- BACTERIA –Vibrio cholera –Shigella –Escherichia coli –Salmonella –Campylobacter jejuni –Yersinia enterocolitica –Staphylococcus –Vibrio parahemolyticus –Clostridium difficile

5 COMMON CAUSES OF DIARRHEA- VIRUS Rotavirus Adenoviruses Caliciviruses Astroviruses Norwalk agents and Norwalk-like viruses

6 COMMON CAUSES OF DIARRHEA- PARASITE Entameba histolytica Giardia lamblia Cryptosporidium Isospora

7 COMMON CAUSES OF DIARRHEA-OTHERS Metabolic disease  Hyperthyroidism  Diabetes mellitus  Pancreatic insufficiency Food allergy  Lactose intolerance Antibiotics Irritable bowel syndrome

8 TRANSMISSION Most of the diarrheal agents are transmitted by the fecal-oral route Some viruses (such as rotavirus) can be transmitted through air Nosocommial transmission is possible Shigella (the bacteria causing dysentery) is mainly transmitted person-to-person


10 PERSON-AT-RISK Cholera: 2 years and above, uncommon in very young infants Shigellosis: more common in young children aged below 5 years Rotavirus diarrhea: more common in young infants and children aged 1-2 years E. coli diarrhea: can occur at any age Amebiasis: more common among adults

11 TYPES OF VIBRIO CHOLERA Two major biotypes of Vibrio cholera that cause diarrhea are:  Classical  ElTor Two common serotypes of Vibrio cholera that cause diarrhea are:  Inaba  Ogawa

12 Vibrio cholerae O139 Vibrio cholerae in O-group 139 was first isolated in 1992 and by 1993 had been found throughout the Indian subcontinent. This epidemic expansion probably resulted from a single source after a lateral gene transfer (LGT) event that changed the serotype of an epidemic V. cholerae O1 El Tor strain to O139. More information: 0760.htm 0760.htm

13 Vibrio vulnificus The organism Vibrio vulnificus causes wound infections, gastroenteritis or a serious syndrome known as "primary septicema." V. vulnificus infections are either transmitted to humans through open wounds in contact with seawater or through consumption of certain improperly cooked or raw shellfish. This bacterium has been isolated from water, sediment, plankton and shellfish (oysters, clams and crabs) located in the Gulf of Mexico, the Atlantic Coast as far north as Cape Cod and the entire U.S. West Coast. Cases of illness have also been associated with brackish lakes in New Mexico and Oklahoma. For more information:

14 TYPES OF SHIGELLA The major serotypes of Shigella that cause diarrhea are:  Dysenteriae type 1 or Shigella shiga  Shigella flexneri  Shigella sonnei  Shigella boydii

15 TYPES OF E. COLI Six major types of Escherichia coli cause diarrhea :  Enterotoxigenic E. coli (ETEC)  Enteroinvasive E. coli (EIEC)  Enteropathogenic E. coli (EPEC)  Enterohemorrhagic E. coli (E. coli O157:H7)  Enteroaggregative E. coli (EAggEC)  Diffuse adherent E. coli (DAEC)

16 CLINICAL FEATURE: CHOLERA Rice-watery stool Marked dehydration Projectile vomiting No fever or abdominal pain Muscle cramps Hypovolemic shock Scanty urine

17 CLINICAL FEATURE: E. COLI DIARRHEA Watery stools Vomiting is common Dehydration moderate to severe Fever– often of moderate grade Mild abdominal pain

18 CLINICAL FEATURE: ROTAVIRUS DIARRHEA Insidious onset Prodromal symptoms, including fever, cough, and vomiting precede diarrhea Stools are watery or semi-liquid; the color is greenish or yellowish– typically looks like yoghurt mixed in water Mild to moderate dehydration Fever– moderate grade

19 CLINICAL FEATURE: SHIGELLOSIS Frequent passage of scanty amount of stools, mostly mixed with blood and mucus Moderate to high grade fever Severe abdominal cramps Tenesmus– pain around anus during defecation Usually no dehydration

20 CLINICAL FEATURE: AMEBIASIS Offensive and bulky stools containing mostly mucus and sometimes blood Lower abdominal cramp Mild grade fever No dehydration

21 LABORATORY DIAGNOSIS Stool microscopy Dark field microscopy of stool for cholera Stool cultures ELISA for rotavirus Immunoassays, bioassays or DNA probe tests to identify E. coli strains




25 TREATMENT Rehydration– replace the loss of fluid and electrolytes Antibiotics– according to the type of pathogens Start food as soon as possible




29 COMPLICATIONS: WATERY DIARRHEA Dehydration Electrolyte imbalances Tetany Convulsions Hypoglycemia Renal failure

30 COMPLICATIONS: DYSENTERY Electrolyte imbalances Convulsions Hemolytic uremic syndrome (HUS) Leukemoid reaction Toxic megacolon Protein losing enteropathy Arthritis Perforation

31 VACCINES An oral cholera vaccine is available, which gives immunity to 50-60% of those who take the vaccine, and this immunity lasts only a few months. No vaccines are available against shigellosis A vaccine against rotavirus diarrhea has been withdrawn recently from the market.

32 PREVENTION Safe drinking water and food “Boil it, cook it, peel it, or forget it. " Hand washing Proper sanitation

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