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Bacterial Diarrhea

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sun yaicheng

on 29 August 2010

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Transcript of Bacterial Diarrhea

CLINICAL PRACTICE
Bacterial Diarrhea Clinical Problem More than 5.2 million cases of bacterial diarrhea that occur each year in the US, estimated 46,000 hospitalizations and 1500 deaths each year in US.

The 4 most commonly reported bacterial enteropathogens in the US:
1. Campylobacter
2. Salmonella
3. Shiga toxin-producing E. coli
4. Shigell Evaluation Stool culture should be obtained from all patients with:

severe diarrhea (passage > 6 unformed stools per day)
diarrhea of any severity that persists > one week
fever
dysentery
multiple cases of illness that suggest an outbreak

Stool cultures are not routine in most cases of watery diarrhea or traveler’s diarrhea because of the low yield of bacterial pathogens.
Conditions Associated with Bacterial Diarrhea Acute Watery Diarrhea
Dysentery
Food Poisoning
Traveler’s Diarrhea
Nosocomial Diarrhea
Dysentery Food Poisoning Traveler’s Diarrhea Nosocomial Diarrhea Passage of bloody stools suggests possible bacterial colitis.

Major causes of bloody diarrhea in the US:
Shigella
Campylobacter
Salmonella
Shiga toxin-producing E. coli

Food poisoning is the term used when a preformed toxin in food is ingested, resulting in an intoxication rather than an enteric infection.
Staphylococcus aureus causes vomiting within 2 to 7 hours after the ingestion of improperly cooked or stored food containing a heat-stable preformed toxin.
Most cases of food poisoning are of short duration, with recovery occurring in 1 to 2 days. The diagnosis is made in nearly all cases clinically without laboratory confirmation.
Traveler’s diarrhea occurs when persons from industrialized regions venture into developing tropical and semitropical areas with reduced levels of personal and food hygiene.
Bacterial enteropathogens cause up to 80% of cases.
E. coli account for more than half of cases occurring in Latin America, Africa, and South Asia.
Campylobacter, shigella, and salmonella are relatively more important causes of traveler’s diarrhea in Asia than in the other high-risk regions.
Patients with traveler’s diarrhea should be treated empirically with antibiotics without stool examination.
Most authorities recommend rifaximin 200 mg once or twice a day (with major meals) while the person is in an area of risk.
Alternative regimen is two tablets of bismuth subsalicylate with each meal and at bedtime.

Indications for the use of chemoprophylaxis

C. difficile accounts for a minority of antibiotic-associated and hospital-associated diarrhea, it should be considered in patients with clinically significant diarrhea (passage > 3 unformed stools per day), toxic dilatation of the colon or otherwise unexplained leukocytosis.
Risk factors for C. difficile diarrhea:
Most bacterial and nonbacterial enteropathogens produce acute watery diarrhea
Severe abdominal pain and cramps and passage > 5 unformed stools per 24 hours in the absence of fever.
Watery diarrhea becomes bloody in 1 to 5 days in 80% of patients;
Infection by Shiga toxin-producing E. coli is the main cause of renal failure in childhood.
2/3 of children with the hemolytic-uremic syndrome require dialysis; mortality rate is 3 to 5%. Acute Watery Diarrhea Clinically nonspecific!


Detectable enteric pathogens is identified < 3% of cases in the US.
Most laboratories stool culture are set up to routinely look for shigella, salmonella, and campylobacter.
Many of the potentially important agents that cause watery diarrhea are not detectable by routine laboratory tests; these agents include entero-toxigenic E. coli, entero-aggregative E. coli, entero-invasive E. coli, non-choleraic vibrios, and noroviruses.
Advanced age and coexisting conditions
alteration of intestinal flora by antimicrobial agents
probably host genetics
N Engl J Med
October 15, 2009;361:1560-9. important trip (the purpose of which might be ruined by a short-term illness)
underlying illness that might be worsened by diarrhea (e.g., CHF)
persons more susceptible to diarrhea (e.g., use of daily PPI therapy)
previous bouts of traveler’s diarrhea Bacterial Diarrhea Thank You for
Your Attention
Treatment Fluid and electrolyte replacement
Easily digestible food
Antimotility drugs such as loperamide and diphenoxylate hydrochloride
Antimicrobial agents
Shiga toxin-producing E. coli Salmonellosis Bacteremia complicates the infection in approximately 8% of normal healthy persons.

Risk factors:
Extremes of age (younger than 3 months and 65 years or older)
Corticosteroid use
Inflammatory bowel disease
Immunosuppression
Hemoglobinopathy including sickle cell disease
Hemodialysis
Some antibacterial drugs, including fluoroquinolones and trimethoprim-sulfamethoxazole, may increase the risk of hemolytic–uremic syndrome.
Most authorities recommend supportive treatment only in patients with Shiga toxin-producing E. coli infection.
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