Approach to the patient with infectious colitis

Area of Science:

• Gastroenterology
• Infectious Diseases
• Microbiology

Background:

• Infectious colitis presents with diarrhea and indicators like fever, dysentery, or inflammatory stool markers.
• Diagnosis involves identifying invasive or inflammatory bacterial enteropathogens via stool culture or endoscopy.

Purpose of the Study:

• To offer current recommendations for evaluating and treating patients diagnosed with infectious colitis.
• To guide clinicians in managing various causes of infectious colitis.

Main Methods:

• Standard stool cultures are essential for diagnosing infectious colitis.
• Specific diagnostic approaches are needed when Shiga toxin-producing E. coli (STEC) is suspected, requiring direct stool testing for E. coli O157:H7 and Shiga toxin.
• Epidemiological factors like travel history can inform the need for specialized etiological studies.

Main Results:

• Pathogen-specific antimicrobial therapy is recommended for all infectious colitis types, excluding STEC infections.
• In cases of febrile dysenteric diarrhea, invasive bacterial enteropathogens such as Shigella, Salmonella, and Campylobacter should be considered.
• Empiric treatment for adults with febrile dysenteric diarrhea may involve a single 1000mg dose of azithromycin.

Conclusions:

• Prompt laboratory diagnosis is crucial for initiating appropriate antimicrobial therapy.
• Tailoring treatment based on the identified pathogen ensures effective management of infectious colitis.
• Azithromycin serves as an effective empiric treatment option for specific bacterial enteropathogen-induced diarrheal illnesses.