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# Overview
Treatment is generally recommended for average-risk patients who are symptomatic with positive lab findings for C. difficile infection. For patients with C. difficile risk factors, empiric therapy is recommended for symptomatic patients regardless of lab findings. Antimicrobial therapy is tailored acccording to the clinical severity of the infection. Administration of oral metronidazole is recommended for patients with mild symptoms, whereas oral vancomycin is recommended for severe disease.

# Indications for Treatment

## Symptomatic vs. Asymptomatic Individuals
- Treatment is recommended only for average-risk, symptomatic patients (usually diarrhea) with positive lab findings (either ELISA or PCR) of C. difficile infection
- In contrast, treatment is not recommended for average-risk, asymptomatic individuals OR patients with diarrhea and negative lab findings (either ELISA or PCR).

## Average Risk vs. High Risk Patients
- The negative predictive values of the diagnostic lab tests (either ELISA or PCR) are sufficiently high > 95% for patients among patients with average risk of developing C. difficile infection. Accordingly, empiric therapy is not recommended if diagnostic lab tests yield negative findings among average-risk patients.
- In contrast the negative predictive values of the diagnostic lab tests (either ELISA or PCR) are NOT sufficiently high for patients at high risk of C. difficile infection. Accordingly, empiric therapy is recommended for high risk patients with high pre-test probability even when lab findings yield negative results. Common risk factors for the development of C. difficile infection are history of antibiotic administration within the past 12 weeks, advanced age > 65 years, immunodeficiency, exposure to healthcare facilities, or inflammatory bowel disease.
For more detailed list of C. difficile risk factors, click here

# Principles of Antimicrobial Therapy for Clostridium difficile infection
According to the 2013 practice guidelines for the diagnosis, treatment, and prevention of C. difficile infections, the choice of antimicrobial therapy is based on the severity of the clinical disease. Shown below is a table that defines the severity of C. difficile infection based on clinical features and lab findings:
 Click on the following categories to expand treatment regimens.

## Duration of antimicrobial therapy
- Administer antimicrobial therapy for 10-14 days.
- Continue antimicrobial therapy only for 10 days if there is clinical improvement within 5 to 7 days.

## Do's
- Suspend other antibiotic therapies during administration of antibiotics to treat C. difficile infection.
- Administer vancomycin for mild-to-moderate patients who are intolerant/allergic to metronidazole and for pregnant/breastfeeding women..
- Deliver supportive care to patients with severe or severe complicated CDI .
- Perform diagnostic abdominal CT scan for patients with worsening diarrhea and/or abdominal pain to rule out C. difficile-associated complications.
- Request surgical consultation and perform routine pre-surgical work-up for patients suspected to have complicated C. difficile infection. To view indications for surgical management of C. difficile infection, click here.
- Consider fecal microbiota transplant if there is a third recurrence after a pulsed vancomycin regimen.
- Consider vancomycin enema for patients whose oral antibiotic regimen cannot reach a segment of the colon, such as patients with Hartman's pouch, ileostomy, or colon diversion.
- Administer intravenous immunoglobulins for recurrent C. difficile infection only if patient has hypogammaglobulinemia.
- Manage C. difficile infection simultaneously with inflammatory bowel disease (IBD) flare-up among patients with IBD.
- Continue immunosuppressive medications for IBD patients with C. difficile infection.

## Don'ts
- Do not administer metronidazole for a second recurrence episode of CDI or for long-term therapy because of the risk of neurotoxicity.
- Do not administer anti-peristaltic agents to treat diarrhea in patients with CDI.
- Do not administer intravenous immunoglobulins for recurrent C. difficile infection, except if patient has hypogammaglobulinemia.
- Do not increase dose of immunosuppressive medications for IBD patients with untreated C. difficile infection.

# Novel Pharmacologic Therapies
- In 2011, fidaxomicin was FDA-approved for the treatment of C. difficile infection.
Fidaxomicin is a poorly absorbed, bactericidal, macrocyclic antibiotic that acts against anaerobic, gram-positive bacteria.
Fidaxomicin demonstrated non-inferior to vancomycin in the treatment of primary infection.
Fidaxomicin was associated with significantly reduced rate of recurrence compared with vancomycin (15% vs. 25%), except among patients infected with BI/NAP1/027 strain where the recurrence rate was statistically similar between both therapies.
- Fidaxomicin is a poorly absorbed, bactericidal, macrocyclic antibiotic that acts against anaerobic, gram-positive bacteria.
- Fidaxomicin demonstrated non-inferior to vancomycin in the treatment of primary infection.
- Fidaxomicin was associated with significantly reduced rate of recurrence compared with vancomycin (15% vs. 25%), except among patients infected with BI/NAP1/027 strain where the recurrence rate was statistically similar between both therapies.

# Fecal Bacteriotherapy
- Fecal bacteriotherapy is a procedure related to probiotic research. It has been suggested as a potential cure for C. difficile infection.
- It involves infusion of bacterial flora acquired from the feces of a healthy donor in an attempt to reverse bacterial imbalance responsible for the recurring nature of the infection.