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[[Virus]]es, particularly [[rotavirus]], are common in children. (Viral diarrhea is probably over-diagnosed by non-doctors). [[Norwalk virus]] can also cause these symptoms.
[[Virus]]es, particularly [[rotavirus]], are common in children. (Viral diarrhea is probably over-diagnosed by non-doctors). [[Norwalk virus]] can also cause these symptoms.


Toxins and food poisoning can cause diarrhea. These include [[Staphylococcus|staphylococcal]] toxin (often from milk products due to an infected wound in workers), and ''[[Bacillus cereus]]''. Often "food poisoning" is really ''Salmonella'' infection.  Diarrhea can also be caused by ingesting foods that contain indigestible material, for instance, [[escolar]] and [[olestra]].
Toxins and food poisoning can cause diarrhea. These include [[Staphylococcus|staphylococcal]] toxin (often from milk products due to an infected wound in workers), and ''[[Bacillus cereus]]''. Often "food poisoning" is really ''Salmonella'' infection.  Diarrhea can also be caused by ingesting foods that contain indigestible material, for instance, escolar and [[olestra]].


Parasites and worms sometimes cause diarrhea but are often accompanied by weight loss, irritability, [[rash]]es or anal itching. The most common is [[pinworm]] (mostly a nuisance rather than a severe medical illness). Other worms, such as [[hookworm]], ascaria, and [[tapeworm]] are more medically significant and may cause weight loss, anemia, general unwellness and allergy problems. [[Amoebic dysentery]] due to ''[[Entamoeba histolytica]]'' is an important cause of bloody diarrhea in travelers and also sometimes in western countries. It requires appropriate and complete medical treatment.
Parasites and worms sometimes cause diarrhea but are often accompanied by weight loss, irritability, [[rash]]es or anal itching. The most common is [[pinworm]] (mostly a nuisance rather than a severe medical illness). Other worms, such as [[hookworm]], ascaria, and [[tapeworm]] are more medically significant and may cause weight loss, anemia, general unwellness and allergy problems. [[Amoebic dysentery]] due to ''[[Entamoeba histolytica]]'' is an important cause of bloody diarrhea in travelers and also sometimes in western countries. It requires appropriate and complete medical treatment.
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In more severe cases, or where it is important to find the cause of the illness, stool cultures are instituted.
In more severe cases, or where it is important to find the cause of the illness, stool cultures are instituted.


Among medical inpatients, the presence of [[fecal leukocytes]] can predict a "breach in the colonic mucosa (any infectious or inflammatory condition, blood in the stool, or acute vascular insufficiency)"<ref name="pmid15004086">{{cite journal |author=Granville LA, Cernoch P, Land GA, Davis JR |title=Performance assessment of the fecal leukocyte test for inpatients |journal=J. Clin. Microbiol. |volume=42 |issue=3 |pages=1254-6 |year=2004 |pmid=15004086 |doi=}}</ref>:
Among medical inpatients, the presence of fecal [[leukocytes]] can predict a "breach in the colonic mucosa (any infectious or inflammatory condition, blood in the stool, or acute vascular insufficiency)"<ref name="pmid15004086">{{cite journal |author=Granville LA, Cernoch P, Land GA, Davis JR |title=Performance assessment of the fecal leukocyte test for inpatients |journal=J. Clin. Microbiol. |volume=42 |issue=3 |pages=1254-6 |year=2004 |pmid=15004086 |doi=}}</ref>:
* [[sensitivity (tests)|sensitivity]] = 28%
* [[sensitivity (tests)|sensitivity]] = 28%
* [[specificity (tests)|specificity]] = 92%
* [[specificity (tests)|specificity]] = 92%
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===Antisecretory agents===
===Antisecretory agents===
A [[randomized controlled trial]] found that [[racecadotril]], an [[enkephalinase]] inhibitor, may reduce the volume of watery diarrhea.<ref name="pmid10944563">{{cite journal |author=Salazar-Lindo E, Santisteban-Ponce J, Chea-Woo E, Gutierrez M |title=Racecadotril in the treatment of acute watery diarrhea in children |journal=N. Engl. J. Med. |volume=343 |issue=7 |pages=463-7 |year=2000 |pmid=10944563 |doi=}}</ref>
A [[randomized controlled trial]] found that [[racecadotril]], an enkephalinase inhibitor, may reduce the volume of watery diarrhea.<ref name="pmid10944563">{{cite journal |author=Salazar-Lindo E, Santisteban-Ponce J, Chea-Woo E, Gutierrez M |title=Racecadotril in the treatment of acute watery diarrhea in children |journal=N. Engl. J. Med. |volume=343 |issue=7 |pages=463-7 |year=2000 |pmid=10944563 |doi=}}</ref>


===Antimicrobial Regimen===
===Antimicrobial Regimen===


====Immunocompetent====
===Immunocompetent Patients===
*'''Bacterial''' <ref name="pmid11170940">{{cite journal| author=Guerrant RL, Van Gilder T, Steiner TS, Thielman NM, Slutsker L, Tauxe RV et al.| title=Practice guidelines for the management of infectious diarrhea. | journal=Clin Infect Dis | year= 2001 | volume= 32 | issue= 3 | pages= 331-51 | pmid=11170940 | doi=10.1086/318514 | pmc= | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=11170940  }} </ref>
*'''Bacterial''' <ref name="pmid11170940">{{cite journal| author=Guerrant RL, Van Gilder T, Steiner TS, Thielman NM, Slutsker L, Tauxe RV et al.| title=Practice guidelines for the management of infectious diarrhea. | journal=Clin Infect Dis | year= 2001 | volume= 32 | issue= 3 | pages= 331-51 | pmid=11170940 | doi=10.1086/318514 | pmc= | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=11170940  }} </ref>


:* '''1. Shigella species'''
:* '''1. Shigella species'''
::*Preferred regimen (1):
::*Preferred regimen (1): [[TMP-SMZ]] 160/800 mg PO bid for 3 days
:::*Adult dose: [[TMP-SMZ]], 160 and 800 mg, respectively bid for 3 days (if susceptible ) {{or}} [[Fluoroquinolone]] (e.g., 300 mg [[Ofloxacin]], 400 mg [[Norfloxacin]], {{or}} 500 mg [[Ciprofloxacin]] bid for 3 days)
::*Preferred regimen (2): [[Ofloxacin]] 300 mg PO bid for 3 days {{or}} [[Norfloxacin]] 400 mg PO bid for 3 days {{or}} [[Ciprofloxacin]] 500 mg PO bid for 3 days
:::*Pediatric dose: [[TMP-SMZ]], 5 and 25 mg/kg, respectively bid for 3 days


::*Preferred regimen (2):
::*Alternative regimen (1): [[Nalidixic acid]]  1 g PO qd for 5 days
:::*Adult dose: [[Nalidixic acid]]  1 g/d for 5 days {{or}} [[Ceftriaxone]]; [[Azithromycin]]
::*Alternative regimen (2): [[Ceftriaxone]] 1-2 g IM/IV qd for 3 days
:::*Pediatric dose: [[Nalidixic acid]],  55 mg/kg/d for 5 days
 
::*Alternative regimen (3): [[Azithromycin]] 500 mg PO qd for 3 days
::*Note: In immunocompromised patients increase treatment duration to 7-10 days.


:*'''2. Non-typhi species of Salmonella'''
:*'''2. Non-typhi species of Salmonella'''
::*Preferred regimen: Not recommended routinely, but if severe or patient is younger than 6 monthes or older than 50 year old or has prostheses, valvular heart disease, severe atherosclerosis, malignancy, or uremia, [[TMP-SMZ]] (if susceptible) {{or}} [[Fluoroquinolone]], bid for 5 to 7 days; [[Ceftriaxone]], 100 mg/kg/d in 1 or 2 divided doses
::*Preferred regimen (1): [[TMP-SMZ]] 160/800 mg PO bid for 3 days
 
::*Preferred regimen (2): [[Ofloxacin]] 300 mg PO bid {{or}} [[Norfloxacin]] 400 mg PO bid {{or}} [[Ciprofloxacin]] 500 mg PO bid for 5-7 days
 
::*Preferred regimen (3): [[Ceftriaxone]] 100 mg/kg/day IV/IM q12h for one day
::*Note (1): Treatment not recommended routinely, but consider if severe or if patient is younger than 6 months old or older than 50 year old or has prostheses, valvular heart disease, severe atherosclerosis, malignancy, or uremia.
::*Note (2): In immunocompromised patients increase treatment duration to 14 days or longer if relapsing.


:*'''3. Campylobacter species'''
:*'''3. Campylobacter species'''
::*Preferred regimen: [[Erythromycin]] 500 mg bid for 5 days
::*Preferred regimen: [[Erythromycin]] 500 mg PO bid for 5 days
::*Note: Immunocompromised patients may require longer treatment.


:*'''4. Escherichia coli species'''
:*'''4. Escherichia coli species'''
::*'''4.1. Enterotoxigenic'''
::*'''4.1. Enterotoxigenic'''
:::*Preferred regimen: [[TMP-SMZ]], 160 and 800 mg, respectively, bid, for 3 days (if susceptible), {{or}} [[Fluoroquinolone]] (e.g., 300 mg [[Ofloxacin]], 400 mg [[Norfloxacin]], or 500 mg [[Ciprofloxacin]] bid for 3 days)
:::*Preferred regimen (1): [[TMP-SMZ]] 160/800 mg PO bid for 3 days
:::*Preferred regimen (2): [[Ofloxacin]] 300 mg PO bid for 3 days {{or}} [[Norfloxacin]] 400 mg PO bid for 3 days {{or}} [[Ciprofloxacin]] 500 mg PO bid for 3 days


::*'''4.2. Enteropathogenic'''
::*'''4.2. Enteropathogenic'''
:::*Preferred regimen: [[TMP-SMZ]], 160 and 800 mg, respectively, bid, for 3 days (if susceptible), {{or}} [[Fluoroquinolone]] (e.g., 300 mg [[Ofloxacin]], 400 mg [[Norfloxacin]], or 500 mg [[Ciprofloxacin]] bid for 3 days)
:::*Preferred regimen (1): [[TMP-SMZ]] 160/800 mg PO bid for 3 days


:::*Preferred regimen (2): [[Ofloxacin]] 300 mg PO bid for 3 days {{or}} [[Norfloxacin]] 400 mg PO bid for 3 days {{or}} [[Ciprofloxacin]] 500 mg PO bid for 3 days
::*'''4.3. Enteroinvasive'''
::*'''4.3. Enteroinvasive'''
:::*Preferred regimen: [[TMP-SMZ]], 160 and 800 mg, respectively, bid, for 3 days (if susceptible), {{or}} [[Fluoroquinolone]] (e.g., 300 mg [[Ofloxacin]], 400 mg [[Norfloxacin]], or 500 mg [[Ciprofloxacin]] bid for 3 days)
:::*Preferred regimen (1): [[TMP-SMZ]] 160/800 mg PO bid for 3 days
 
::*'''4.4. Enterohemorrhagic'''
:::*Preferred regimen: Avoid antimotility drugs; role of antibiotics unclear, and administration should be avoided.
 
:*'''5. Aeromonas/Plesiomonas'''
::*Preferred regimen: [[TMP-SMZ]], 160 and 800 mg, respectively, bid for 3 days (if susceptible), [[Fluoroquinolone]] (e.g., 300 mg [[Ofloxacin]], 400 mg [[Norfloxacin]], or 500 mg [[Ciprofloxacin]] bid for 3 days)
 
:*'''6. Yersinia species'''
::*Preferred regimen: Antibiotics are not usually required; [[Deferoxamine]] therapy should be withheld; for severe infections or associated bacteremia treat as for immunocompromised hosts, using combination therapy with [[Doxycycline]], [[Aminoglycoside]], [[TMP-SMZ]], {{or}} [[Fluoroquinolone]]
 
:*'''7. Vibrio cholerae O1 or O139'''
::*Preferred regimen (1): [[Doxycycline]] 300-mg single dose
::*Preferred regimen (2): [[Tetracycline]] 500 mg qid for 3 days
::*Preferred regimen (3): [[TMP-SMZ]] 160 and 800 mg, respectively, bid for 3 days
::*Preferred regimen (4): single-dose [[Fluoroquinolone]]
 
:*'''8. Toxigenic Clostridium difficile'''
::*Preferred regimen: Offending antibiotic should be withdrawn if possible; [[Metronidazole]], 250 mg qid to 500 mg tid for 3 to 10 days
 
*'''Parasites''' <ref name="pmid11170940">{{cite journal| author=Guerrant RL, Van Gilder T, Steiner TS, Thielman NM, Slutsker L, Tauxe RV et al.| title=Practice guidelines for the management of infectious diarrhea. | journal=Clin Infect Dis | year= 2001 | volume= 32 | issue= 3 | pages= 331-51 | pmid=11170940 | doi=10.1086/318514 | pmc= | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=11170940  }} </ref>
:*'''1. Giardia'''
::*Preferred regimen: [[Metronidazole]] 250-750 mg tid  for 7-10 days
 
:*'''2. Cryptosporidium species'''
::*Preferred regimen: If severe, consider [[Paromomycin]], 500 mg tid for 7 days
 
:*'''3. Isospora species'''
::*Preferred regimen: [[TMP-SMZ]], 160 and 800 mg, respectively, bid for 7 to 10 days
 
:*'''4. Cyclospora species'''
::*Preferred regimen: [[TMP/SMZ]], 160 and 800 mg, respectively, bid for 7 days
 
:*'''5. Microsporidium species'''
::*Preferred regimen: Not determined


:*'''6. Entamoeba histolytica'''
:::*Preferred regimen (2): [[Ofloxacin]] 300 mg PO bid for 3 days {{or}} [[Norfloxacin]] 400 mg PO bid for 3 days {{or}} [[Ciprofloxacin]] 500 mg PO bid for 3 days
::*Preferred regimen (1): [[Metronidazole]] 750 mg tid for 5 to 10 days {{and}} [[Diiodohydroxyquinoline|Diiodohydroxyquin]] 650 mg tid for 20 days
::*Preferred regimen (2): [[Metronidazole]] 750 mg tid for 5 to 10 days {{and}} [[Paromomycin]] 500 mg tid for 7 days


====Immunocompromised====
::*'''4.4. Enteroaggregative'''
*'''Bacterial''' <ref name="pmid11170940">{{cite journal| author=Guerrant RL, Van Gilder T, Steiner TS, Thielman NM, Slutsker L, Tauxe RV et al.| title=Practice guidelines for the management of infectious diarrhea. | journal=Clin Infect Dis | year= 2001 | volume= 32 | issue= 3 | pages= 331-51 | pmid=11170940 | doi=10.1086/318514 | pmc= | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=11170940  }} </ref>
:::*Preferred regimen: Unknown
:* '''1. Shigella species:'''
:::*Note: In immunocompromised patients consider [[Ofloxacin]] 300 mg PO bid for 3 days {{or}} [[Norfloxacin]] 400 mg PO bid for 3 days {{or}} [[Ciprofloxacin]] 500 mg PO bid for 3 days
::*Preferred regimen (1):
:::*Adult dose: [[TMP-SMZ]], 160 and 800 mg, respectively bid for 7 to 10 days (if susceptible ) {{or}} [[Fluoroquinolone]] (e.g., 300 mg [[Ofloxacin]], 400 mg [[Norfloxacin]], {{or}} 500 mg [[Ciprofloxacin]] bid for 7 to 10 days)
:::*Pediatric dose:[[TMP-SMZ]], 5 and 25 mg/kg, respectively bid for 7 to 10 days


::*Preferred regimen (2):
::*'''4.5. Enterohemorrhagic'''
:::*Adult dose: [[Nalidixic acid]]  1 g/d for 7 to 10 days {{or}} [[Ceftriaxone]]; [[Azithromycin]]
:::*Preferred regimen: Avoid antibiotics as role remains unclear.
:::*Pediatric dose:  [[Nalidixic acid]],  55 mg/kg/d for 7 to 10 days
 
:*'''2. Non-typhi species of Salmonella'''
::*Preferred regimen: Not recommended routinely, but if severe or patient is younger than 6 monthes or older than 50 old or has prostheses, valvular heart disease, severe atherosclerosis, malignancy, or uremia, [[TMP-SMZ]] (if susceptible) {{or}} [[Fluoroquinolone]], bid for 14 days (or longer if relapsing); [[ceftriaxone]], 100 mg/kg/d in 1 or 2 divided doses
 
:*'''3. Campylobacter species'''
::*Preferred regimen: [[Erythromycin]], 500 mg bid for 5 days (may require prolonged treatment)
 
:*'''4. Escherichia coli species'''
::*4.1. Enterotoxigenic
:::*Preferred regimen: [[TMP-SMZ]], 160 and 800 mg, respectively, bid for 3 days (if susceptible), {{or}} [[Fluoroquinolone]] (e.g., 300 mg [[Ofloxacin]], 400 mg [[Norfloxacin]], or 500 mg [[Ciprofloxacin]] bid for 3 days) (Consider fluoroquinolone as for enterotoxigenic E. coli)
 
::*'''4.2. Enteropathogenic'''
:::*Preferred regimen: [[TMP-SMZ]], 160 and 800 mg, respectively, bid,for 3 days (if susceptible), {{or}} [[Fluoroquinolone]] (e.g., 300 mg [[Ofloxacin]], 400 mg [[Norfloxacin]], or 500 mg [[Ciprofloxacin]] bid for 3 days)
 
::*'''4.3. Enteroinvasive'''
:::*Preferred regimen: [[TMP-SMZ]], 160 and 800 mg, respectively, bid,for 3 days (if susceptible), {{or}} [[Fluoroquinolone]] (e.g., 300 mg [[Ofloxacin]], 400 mg [[Norfloxacin]], or 500 mg [[Ciprofloxacin]] bid for 3 days)
 
::*'''4.4. Enterohemorrhagic'''
:::*Preferred regimen: Avoid antimotility drugs; role of antibiotics unclear, and administration should be avoided.


:*'''5. Aeromonas/Plesiomonas'''
:*'''5. Aeromonas/Plesiomonas'''
::*Preferred regimen: [[TMP-SMZ]], 160 and 800 mg, respectively, bid for 3 days (if susceptible), [[Fluoroquinolone]] (e.g., 300 mg [[ofloxacin]], 400 mg [[norfloxacin]], or 500 mg [[Ciprofloxacin]] bid for 3 days)
:::*Preferred regimen (1): [[TMP-SMZ]] 160/800 mg PO bid for 3 days


:::*Preferred regimen (2): [[Ofloxacin]] 300 mg PO bid for 3 days {{or}} [[Norfloxacin]] 400 mg PO bid for 3 days {{or}} [[Ciprofloxacin]] 500 mg PO bid for 3 days
:*'''6. Yersinia species'''
:*'''6. Yersinia species'''
::*Preferred regimen: [[Doxycycline]], [[Aminoglycoside]] (in combination) or [[TMP-SMZ]] or [[Fluoroquinolone]]
::*Preferred regimen: Antibiotics are not usually required.
::*Note (1): [[Deferoxamine]] therapy should be withheld.
::*Note (2): For immunocompromised patients, severe infections, or associated bacteremia treat using combination therapy with [[Doxycycline]] {{and}} either [[Aminoglycoside]] {{or}} [[TMP-SMZ]] {{or}} {{or}} [[Fluoroquinolone]]


:*'''7. Vibrio cholerae O1 or O139'''
:*'''7. Vibrio cholerae O1 or O139'''
::*Preferred regimen: [[Doxycycline]], 300-mg single dose; or [[Tetracycline]], 500 mg qid for 3 days; or [[TMP-SMZ]], 160 and 800 mg, respectively, bid for 3 days; or single-dose [[Fluoroquinolone]]
::*Preferred regimen (1): [[Doxycycline]] 300 mg PO single dose
::*Preferred regimen (2): [[Tetracycline]] 500 mg PO qid for 3 days
::*Preferred regimen (3): [[TMP-SMZ]] 160/800 mg PO bid for 3 days
::*Preferred regimen (4): [[Ofloxacin]] 300 mg PO single dose {{or}} [[Norfloxacin]] 400 mg PO single dose {{or}} [[Ciprofloxacin]] 500 mg PO single dose


:*'''8. Toxigenic Clostridium difficile'''
:*'''8. Toxigenic Clostridium difficile'''
::*Preferred regimen: Offending antibiotic should be withdrawn if possible; [[Metronidazole]], 250 mg qid to 500 mg tid for 3 to 10 days
::*Preferred regimen: [[Metronidazole]] 250 mg PO qid / 500 mg PO tid for 3 to 10 days
::*Note: Withhold offending antibiotic if possible.


*'''Parasites''' <ref name="pmid11170940">{{cite journal| author=Guerrant RL, Van Gilder T, Steiner TS, Thielman NM, Slutsker L, Tauxe RV et al.| title=Practice guidelines for the management of infectious diarrhea. | journal=Clin Infect Dis | year= 2001 | volume= 32 | issue= 3 | pages= 331-51 | pmid=11170940 | doi=10.1086/318514 | pmc= | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=11170940  }} </ref>
*'''Parasites''' <ref name="pmid11170940">{{cite journal| author=Guerrant RL, Van Gilder T, Steiner TS, Thielman NM, Slutsker L, Tauxe RV et al.| title=Practice guidelines for the management of infectious diarrhea. | journal=Clin Infect Dis | year= 2001 | volume= 32 | issue= 3 | pages= 331-51 | pmid=11170940 | doi=10.1086/318514 | pmc= | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=11170940  }} </ref>
:*'''1. Giardia'''
:*'''1. Giardia'''
::*Preferred regimen: [[Metronidazole]], 250-750 mg tid  for 7-10 days
::*Preferred regimen: [[Metronidazole]] 250-750 mg tid  for 7-10 days


:*'''2. Cryptosporidium species'''
:*'''2. Cryptosporidium species'''
::*Preferred regimen: [[Paromomycin]], 500 mg tid for 14 to 28 days, then bid if needed; highly active antiretroviral therapy including a protease inhibitor is warranted for patients with AIDS
::*Preferred regimen: No treatment.
::Note (1): If severe, consider [[Paromomycin]] 500 mg tid for 7 days
::Note (2): For immunocompromised patients, [[Paromomycin]] 500 mg tid for 14-28 days, then bid if needed.


:*'''3. Isospora species'''
:*'''3. Isospora species'''
::*Preferred regimen: [[TMP-SMZ]], 160 and 800 mg, respectively, qid for 10 days, followed by [[TMP-SMZ]] thrice weekly, or weekly [[Sulfadoxine]] (500 mg) and [[Pyrimethamine]] (25 mg) indefinitely for patients with AIDS
::*Preferred regimen: [[TMP-SMZ]] 160/800 mg PO bid for 7 to 10 days
::*Note: For immunocompromised patients, [[TMP-SMZ]] 160/800 mg PO qid for 10 days. If patient has AIDS, follow by [[TMP-SMZ]] 160/800 mg PO 3x weekly {{or}} ([[Sulfadoxine]] 500 mg PO {{and}} [[Pyrimethamine]] 25 mg PO) qw indefinitely.


:*'''4. Cyclospora species'''
:*'''4. Cyclospora species'''
::*Preferred regimen: [[TMP-SMZ]], 160 and 800 mg, respectively, qid for 10 days, followed by [[TMP-SMZ]] thrice weekly indefinitely  
::*Preferred regimen: [[TMP-SMZ]] 160/800 mg PO bid for 7 days
::*Note: For immunocompromised patients, [[TMP-SMZ]] 160/800 mg PO qid for 10 days. If patient has AIDS, follow by [[TMP-SMZ]] 160/800 mg PO 3x weekly indefinitely.


:*'''5. Microsporidium species'''
:*'''5. Microsporidium species'''
::*Preferred regimen: [[Albendazole]], 400 mg bid for 3 weeks; highly active antiretroviral therapy including a protease inhibitor is warranted for patients with AIDS
::*Preferred regimen: Unknown


:*'''6. Entamoeba histolytica'''
:*'''6. Entamoeba histolytica'''
::*Preferred regimen: [[Metronidazole]], 750 mg tid for 5 to 10 days, plus either [[Diiodohydroxyquinoline|Diiodohydroxyquin]], 650 mg tid for 20 days, or [[Paromomycin]], 500 mg tid for 7 days
::*Preferred regimen (1): [[Metronidazole]] 750 mg PO tid for 5 to 10 days {{and}} [[Diiodohydroxyquinoline|Diiodohydroxyquin]] 650 mg PO tid for 20 days
::*Preferred regimen (2): [[Metronidazole]] 750 mg PO tid for 5 to 10 days {{and}} [[Paromomycin]] 500 mg PO tid for 7 days


==Prognosis==
==Prognosis==
Acute infectious diarrhea usually lasts 7 days when not treated with antibiotics.<ref name="pmid1616214"/> It is not uncommon for diarrhea to persist. Diarrhea due to some organisms may persist for years without significant long term illness. More commonly the diarrhea slowly ameliorates but the patient becomes a carrier (harbors the infection without illness). This is often an indication for treatment, especially in food workers or institution workers.
Acute infectious diarrhea usually lasts 7 days when not treated with antibiotics.<ref name="pmid1616214">{{cite journal| author=Wiström J, Jertborn M, Ekwall E, Norlin K, Söderquist B, Strömberg A et al.| title=Empiric treatment of acute diarrheal disease with norfloxacin. A randomized, placebo-controlled study. Swedish Study Group. | journal=Ann Intern Med | year= 1992 | volume= 117 | issue= 3 | pages= 202-8 | pmid=1616214 | doi= | pmc= | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=1616214  }} </ref> It is not uncommon for diarrhea to persist. Diarrhea due to some organisms may persist for years without significant long term illness. More commonly the diarrhea slowly ameliorates but the patient becomes a carrier (harbors the infection without illness). This is often an indication for treatment, especially in food workers or institution workers.


''[[Salmonella]]'' is the most common persistent bacterial organism in humans.
''[[Salmonella]]'' is the most common persistent bacterial organism in humans.


==References==
==References==
<references/>
{{reflist|2}}




Latest revision as of 15:46, 23 November 2015

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]Associate Editor(s)-in-Chief: Faizan Sheraz, M.D. [2]

Overview

See also Bacterial gastroenteritis and Gastroenteritis and Enteritis

This may be defined as diarrhea that lasts less than three and a half weeks, and is also called enteritis.

Cause/Etiology

This can nearly always be presumed to be infective, although only in a minority of cases is this formally proven. The diarrhea is usually viral in origin, and is mostly caused by Norovirus, Rotavirus, Adenovirus, or Astrovirus.

The most common organisms found are Campylobacter (from animal products), Salmonella (also often from animal foodstuffs), Cryptosporidium (ditto), and Giardia lamblia (lives in water). Shigella dysentery is less common, and usually human in origin. Cholera is rare in Western countries. It is more common in travelers and is usually related to contaminated water (its ultimate source is probably sea water). Escherichia coli is probably a very common cause of diarrhea, especially Traveler's diarrhea, but it can be difficult to detect using current technology. The types of E. coli vary from area to area and country to country. Clostridium difficile is considered the most common cause of infectious diarrhea in hospitalized patients worldwide.[1]

Viruses, particularly rotavirus, are common in children. (Viral diarrhea is probably over-diagnosed by non-doctors). Norwalk virus can also cause these symptoms.

Toxins and food poisoning can cause diarrhea. These include staphylococcal toxin (often from milk products due to an infected wound in workers), and Bacillus cereus. Often "food poisoning" is really Salmonella infection. Diarrhea can also be caused by ingesting foods that contain indigestible material, for instance, escolar and olestra.

Parasites and worms sometimes cause diarrhea but are often accompanied by weight loss, irritability, rashes or anal itching. The most common is pinworm (mostly a nuisance rather than a severe medical illness). Other worms, such as hookworm, ascaria, and tapeworm are more medically significant and may cause weight loss, anemia, general unwellness and allergy problems. Amoebic dysentery due to Entamoeba histolytica is an important cause of bloody diarrhea in travelers and also sometimes in western countries. It requires appropriate and complete medical treatment.

Diagnosis

In more severe cases, or where it is important to find the cause of the illness, stool cultures are instituted.

Among medical inpatients, the presence of fecal leukocytes can predict a "breach in the colonic mucosa (any infectious or inflammatory condition, blood in the stool, or acute vascular insufficiency)"[2]:

Differential Diagnosis

Acute inflammatory diarrhea may be caused by different pathogens. Bellow is a table describing some of these pathogens in terms of transmission and symptoms:[3][4]

Pathogen Transmission Clinical Manifestations
Fever Nausea/Vomiting Abdominal Pain Bloody Stool
Salmonella Foodborne transmission, community-acquired ++ + ++ +
Shigella Community-acquired, person-to-person ++ ++ ++ +
Campylobacter Community-acquired, ingestion of undercooked poultry ++ + ++ +
E. coli (EHEC or EIEC) Foodborne transmission, ingestion of undercooked hamburger meat ± + ++ ++
Clostridium difficile Nosocomial spread, antibiotic use + ± + +
Yersinia Community-aquired, foodborne transmission ++ + ++ +
Entamoeba histolytica Travel to or emigration from tropical regions + ± + ±
Aeromonas Ingestion of contaminated water ++ + ++ +
Plesiomonas Ingestion of contaminated water or undercooked shellfish, travel to tropical regions ± ++ + +

Treatment

With mild cases of acute diarrhea, it is often reasonable to reassure a patient, ensure adequate fluid intake, and wait and see.

Parasites (worms and amoeba) should always be treated with antimicrobial drugs.

Antimotility agents

Loperamide can reduce diarrhea in patients with shigella[5], but not in patients with traveler's diarrhea due to enterotoxigenic E. coli.[6]

A systematic review of randomized controlled trials found that loperamide may harm children less that 3 years old.

Antisecretory agents

A randomized controlled trial found that racecadotril, an enkephalinase inhibitor, may reduce the volume of watery diarrhea.[7]

Antimicrobial Regimen

Immunocompetent Patients

  • 1. Shigella species
  • Alternative regimen (3): Azithromycin 500 mg PO qd for 3 days
  • Note: In immunocompromised patients increase treatment duration to 7-10 days.
  • 2. Non-typhi species of Salmonella
  • Preferred regimen (1): TMP-SMZ 160/800 mg PO bid for 3 days
  • Preferred regimen (3): Ceftriaxone 100 mg/kg/day IV/IM q12h for one day
  • Note (1): Treatment not recommended routinely, but consider if severe or if patient is younger than 6 months old or older than 50 year old or has prostheses, valvular heart disease, severe atherosclerosis, malignancy, or uremia.
  • Note (2): In immunocompromised patients increase treatment duration to 14 days or longer if relapsing.
  • 3. Campylobacter species
  • Preferred regimen: Erythromycin 500 mg PO bid for 5 days
  • Note: Immunocompromised patients may require longer treatment.
  • 4. Escherichia coli species
  • 4.1. Enterotoxigenic
  • 4.2. Enteropathogenic
  • Preferred regimen (1): TMP-SMZ 160/800 mg PO bid for 3 days
  • 4.3. Enteroinvasive
  • Preferred regimen (1): TMP-SMZ 160/800 mg PO bid for 3 days
  • 4.4. Enteroaggregative
  • Preferred regimen: Unknown
  • Note: In immunocompromised patients consider Ofloxacin 300 mg PO bid for 3 days OR Norfloxacin 400 mg PO bid for 3 days OR Ciprofloxacin 500 mg PO bid for 3 days
  • 4.5. Enterohemorrhagic
  • Preferred regimen: Avoid antibiotics as role remains unclear.
  • 5. Aeromonas/Plesiomonas
  • Preferred regimen (1): TMP-SMZ 160/800 mg PO bid for 3 days
  • 6. Yersinia species
  • Preferred regimen: Antibiotics are not usually required.
  • Note (1): Deferoxamine therapy should be withheld.
  • Note (2): For immunocompromised patients, severe infections, or associated bacteremia treat using combination therapy with Doxycycline AND either Aminoglycoside OR TMP-SMZ OR OR Fluoroquinolone
  • 7. Vibrio cholerae O1 or O139
  • 8. Toxigenic Clostridium difficile
  • Preferred regimen: Metronidazole 250 mg PO qid / 500 mg PO tid for 3 to 10 days
  • Note: Withhold offending antibiotic if possible.
  • 1. Giardia
  • 2. Cryptosporidium species
  • Preferred regimen: No treatment.
Note (1): If severe, consider Paromomycin 500 mg tid for 7 days
Note (2): For immunocompromised patients, Paromomycin 500 mg tid for 14-28 days, then bid if needed.
  • 3. Isospora species
  • Preferred regimen: TMP-SMZ 160/800 mg PO bid for 7 to 10 days
  • Note: For immunocompromised patients, TMP-SMZ 160/800 mg PO qid for 10 days. If patient has AIDS, follow by TMP-SMZ 160/800 mg PO 3x weekly OR (Sulfadoxine 500 mg PO AND Pyrimethamine 25 mg PO) qw indefinitely.
  • 4. Cyclospora species
  • Preferred regimen: TMP-SMZ 160/800 mg PO bid for 7 days
  • Note: For immunocompromised patients, TMP-SMZ 160/800 mg PO qid for 10 days. If patient has AIDS, follow by TMP-SMZ 160/800 mg PO 3x weekly indefinitely.
  • 5. Microsporidium species
  • Preferred regimen: Unknown
  • 6. Entamoeba histolytica

Prognosis

Acute infectious diarrhea usually lasts 7 days when not treated with antibiotics.[9] It is not uncommon for diarrhea to persist. Diarrhea due to some organisms may persist for years without significant long term illness. More commonly the diarrhea slowly ameliorates but the patient becomes a carrier (harbors the infection without illness). This is often an indication for treatment, especially in food workers or institution workers.

Salmonella is the most common persistent bacterial organism in humans.

References

  1. ↑ "Clostridium difficile (C. difficile): Questions and Answers - Public Health Agency of Canada". Retrieved 2007-08-16.
  2. ↑ Granville LA, Cernoch P, Land GA, Davis JR (2004). "Performance assessment of the fecal leukocyte test for inpatients". J. Clin. Microbiol. 42 (3): 1254–6. PMID 15004086.
  3. ↑ Thielman NM, Guerrant RL (2004). "Clinical practice. Acute infectious diarrhea". N Engl J Med. 350 (1): 38–47. doi:10.1056/NEJMcp031534. PMID 14702426.
  4. ↑ Khan AM, Faruque AS, Hossain MS, Sattar S, Fuchs GJ, Salam MA (2004). "Plesiomonas shigelloides-associated diarrhoea in Bangladeshi children: a hospital-based surveillance study". J Trop Pediatr. 50 (6): 354–6. doi:10.1093/tropej/50.6.354. PMID 15537721.
  5. ↑ Murphy GS, Bodhidatta L, Echeverria P; et al. (1993). "Ciprofloxacin and loperamide in the treatment of bacillary dysentery". Ann. Intern. Med. 118 (8): 582–6. PMID 8452323.
  6. ↑ Taylor DN, Sanchez JL, Candler W, Thornton S, McQueen C, Echeverria P (1991). "Treatment of travelers' diarrhea: ciprofloxacin plus loperamide compared with ciprofloxacin alone. A placebo-controlled, randomized trial". Ann. Intern. Med. 114 (9): 731–4. PMID 2012354.
  7. ↑ Salazar-Lindo E, Santisteban-Ponce J, Chea-Woo E, Gutierrez M (2000). "Racecadotril in the treatment of acute watery diarrhea in children". N. Engl. J. Med. 343 (7): 463–7. PMID 10944563.
  8. ↑ 8.0 8.1 Guerrant RL, Van Gilder T, Steiner TS, Thielman NM, Slutsker L, Tauxe RV; et al. (2001). "Practice guidelines for the management of infectious diarrhea". Clin Infect Dis. 32 (3): 331–51. doi:10.1086/318514. PMID 11170940.
  9. ↑ Wiström J, Jertborn M, Ekwall E, Norlin K, Söderquist B, Strömberg A; et al. (1992). "Empiric treatment of acute diarrheal disease with norfloxacin. A randomized, placebo-controlled study. Swedish Study Group". Ann Intern Med. 117 (3): 202–8. PMID 1616214.


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