15 results
Shigellosis 
Clinical 
• High fever 
• Abdominal cramps 
• Bloody, mucoid diarrhea 
Complications 
• Bacteremia and
#Shigellosis #Shigella
Colitis - Differential Diagnosis by Segment Location

Ascending Colon:
 - Shigella
 - Salmonella
 - Amebic colitis
Hepatic flexure:
Ascending Colon: - Shigella ... Appendix: - Shigella
Pathogens Causing Bloody Diarrhea = SEECSY Mnemonic

SEECSY= Bloody diarrhea doesn’t sounds SEXY 
S = Salmonella
E =
Campylobacter S = Shigella
Acute Diarrhea - Differential Diagnostic Algorithm
Watery/Large Volume (Small Bowel)
 • Viral
 • Bacterial (e.g. C peffrjngens,
Campylobacter, Shigella
Important causes of diarrhea in people with HIV/AIDS
Severity, chronicity/persistence will depend On CD4 count & sites
Others: E. coli, Shigella
Acute Diarrhea - Differential Diagnosis Framework
1)  Diagnostic studies only for dysentery, severe disease, >7 days
2)
Campylobacter, EHEC, EIEC, Shigella
Causes of Acute Infectious Diarrhea
Noninflammatory Diarrhea
Viral - Noroviruses, astrovirus, adenovirus, Rotavirus, sapovirus
Protozoal - Giardia lamblia, Cryptosporidium,
Mucosal invasion - Shigella
Infectious Diarrhea - Laboratory Testing

Clostridium difficile
Salmonella enterica, Shigella spp, Campylobacter spp 
Salmonella enterica serovars Typhi and
Salmonella enterica, Shigella
IBD Mimics
Infectious - Always RULE OUT infection (CMV, C. diff esp.) obtain travel & exposures history:
CMV, Salmonella, Shigella
Clinical Presentations Suggestive of Infectious Diarrhea Etiologies
 • Persistent or chronic diarrhea - Cryptosporidium spp, Giardia
stool - STEC, Shigella ... STEC, Salmonella, Shigella ... STEC, Salmonella, Shigella