Fluoroquinolones and bacterial enteritis, when and for whom?

Area of Science:

• Infectious Diseases
• Pharmacology
• Gastroenterology

Background:

• Quinolones are widely used for bacterial enteric infections, including traveler's diarrhea, shigellosis, and typhoid fever.
• Previous studies show quinolones are effective for traveler's diarrhea and shigellosis but less so for uncomplicated Salmonella and Campylobacter enteritis.

Purpose of the Study:

• To evaluate the efficacy of norfloxacin for empirical treatment of suspected bacterial enteritis.
• To determine if early treatment and patient severity influence norfloxacin's effectiveness.

Main Methods:

• A large placebo-controlled trial involving 259 culture-positive patients with bacterial enteritis of less than 6 days duration.
• Norfloxacin was administered for empirical treatment, with outcomes assessed based on clinical response and time to treatment initiation.

Main Results:

• While statistical differences favored norfloxacin in culture-positive patients, the clinical significance was questionable.
• Severely ill patients initiating norfloxacin treatment within 48 hours of symptom onset showed a clear beneficial effect, similar to traveler's diarrhea treatment.
• Resistance in Campylobacter spp. and failure to eradicate Salmonella spp. limit quinolone efficacy.

Conclusions:

• Quinolones are recommended for traveler's diarrhea, shigellosis, and enteric fever.
• Routine empirical use of quinolones for Salmonella and Campylobacter enteritis is not advised due to resistance and efficacy issues.
• Treatment should be reserved for early intervention in severely ill or vulnerable patients with underlying health conditions.