Gastrointestinal Conditions: Acute Infectious Gastroenteritis and Colitis

Area of Science:

• Gastroenterology
• Infectious Diseases
• Microbiology

Background:

• Gastroenteritis and colitis involve stomach/intestinal inflammation, commonly caused by viruses, bacteria, or parasites.
• Vaccinations significantly reduce certain infections, like rotavirus in children.
• Postinfectious complications, including irritable bowel syndrome (IBS) and lactose intolerance, affect a notable percentage of patients.

Purpose of the Study:

• To outline the diagnostic and management strategies for gastroenteritis and colitis.
• To highlight the link between acute infections and the development of postinfectious IBS.
• To emphasize appropriate testing and treatment based on clinical presentation and severity.

Main Methods:

• Diagnostic approach varies by symptom severity; microbial studies are reserved for persistent or severe cases.
• Multiplex antimicrobial testing is the preferred method for identifying pathogens.
• Stool cultures and microscopic examinations are no longer considered first-line diagnostic tests.

Main Results:

• Approximately 9% of patients with acute gastroenteritis/colitis develop postinfectious IBS, contributing over 50% of all IBS cases.
• Mild to moderate symptoms are managed with oral hydration if tolerated.
• Severe symptoms may require nasogastric or intravenous hydration, alongside medications for symptom control.

Conclusions:

• Management strategies for gastroenteritis and colitis are tailored to symptom severity.
• Antimicrobial therapy is reserved for specific conditions like *Clostridioides difficile* infections, severe bacterial infections, and parasitic infections.
• Early and appropriate diagnosis and management are crucial to prevent long-term complications such as IBS.