Recommendations for the Use of Antibiotics for the Treatment of Cholera
- Oral or intravenous hydration is the mainstay of cholera treatment.
- In conjunction with hydration, treatment with antibiotics is recommended for severely ill patients. It is particularly recommended for patients who are severely or moderately dehydrated and continue to pass a large volume of stool during rehydration treatment. Antibiotic treatment is also recommended for all patients who are hospitalized.
- Antibiotic choices should be informed by local antibiotic susceptibility patterns. In most countries, Doxycycline is recommended as first-line treatment for adults, while azithromycin is recommended as first-line treatment for children and pregnant women. During an epidemic or outbreak, antibiotic susceptibility should be monitored through regular testing of sample isolates from various geographic areas.
- None of the guidelines recommend antibiotics as prophylaxis for cholera prevention, and all emphasize that antibiotics should be used in conjunction with aggressive hydration.
- Education of health care workers, assurance of adequate supplies, and monitoring of practices are all important for appropriate dispensation of antibiotics.
- Mainstay of cholera treatment is hydration
Intravenous 1 and oral 2 hydration are both associated with greatly decreased mortality and remain the mainstay of treatment for cholera.
- Antibiotic effectiveness for the treatment of cholera
- Antibiotics have been used as an adjunct to hydration treatment for cholera since 1964. Findings from randomized controlled trials evaluated the effectiveness of selected antibiotics on three main outcomes: stool output, duration of diarrhea, and bacterial shedding.These studies compared outcomes for cholera patients who were given both intravenous (IV) fluids and antibiotic treatment with those given IV fluids only. Findings indicate that antibiotics reduced volume of stool output by 8-92%, duration of diarrhea by 50-56%, and duration of positive bacterial culture by 26-83% 3–7.
- Antibiotic use for moderately and severely ill patients is also likely to reduce resource requirements. By decreasing duration of diarrhea and stool volume, antibiotics result in more rapid recovery and shorter lengths of inpatient stay, both of which contribute to optimizing resource utilization in an outbreak setting.
- The majority of published studies exploring effectiveness of antibiotics for cholera patients have been done in patients who were adequately rehydrated. In these studies, there was no mortality and therefore the impact of antibiotics on mortality cannot be assessed. In the absence of adequate rehydration, antibiotics alone are not sufficient to prevent cholera mortality.
- Antibiotic regimens for the treatment of cholera
Tetracycline has been shown to be effective treatment for cholera 2, 3 and is superior to furazolidone 8, cholamphenicol 9 and sulfaguanidine 9 in reducing cholera morbidity. Treatment with a single 300mg dose of doxycycline has shown to be equivalent to tetracycline treatment 10. Erythromycin is effective for cholera treatment, and appropriate for children and pregnant women 11. Orfloxacin 12, trimethoprim-sulfamethoxazole (TMP-SMX) 13, and ciprofloxacin 14 are effective, but doxycycline offers advantages related to ease of administration and comparable or superior effectiveness. Recently, azithromycin has been shown to be more effective than erythromycin and ciprofloxacin 15, 16 and is an appropriate first line regimen for children and pregnant women.
- Antibiotic resistance
Resistance to tetracycline and other antimicrobial agents among V. cholerae has been demonstrated in both endemic and epidemic cholera settings. Resistance can be acquired through the accumulation of selected mutations over time, or the acquisition of genetic elements such as plasmids, introns, or conjugative elements, which confer rapid spread of resistance. A likely risk factor for antimicrobial resistance is widespread use of antibiotics, including mass distribution for prophylaxis in asymptomatic individuals. Antibiotic resistance emerged in previous epidemics in the context of antibiotic prophylaxis for household contacts of cholera patients 17, 18.
- Unanswered questions
Inadequate information still exists with respect to antibiotics in the following areas:
- Effect of antibiotics on secondary transmission:
- Utility of antibiotics when aggressive rehydration is not possible:
- Because studies on antibiotic treatment for cholera were conducted in patients who received adequate rehydration, the effect of antibiotics in settings where this is not possible remains unclear.
- Summary of Antibiotic Treatment Guidelines
Various organizations that participate in cholera responses recommend the use of antibiotics in cholera-infected patients with moderate or severe illness and who have begun IV hydration. None of the guidelines recommend antibiotics as prophylaxis for cholera prevention, and all emphasize that antibiotics should be used in conjunction with aggressive hydration. In addition, the guidelines recommend that antimicrobial susceptibility testing should inform local drug choices. Available guidelines are summarized below.
First-line drug choice
Alternate drug choices
Drug choices for special populations
|World Health Organization 21||Antibiotic treatment for cholera patients with severe dehydration only||Doxycycline||Tetracycline||Erythromycin is recommended drug for children|
|Pan American Health Organization 22||Antibiotic treatment for cholera patients with moderate or severe dehydration||Doxycycline||Ciprofloxacin Azithromycin||Erythromycin or azithromycin recommended as first-line drugs for pregnant women and children Ciprofloxacin and doxycycline recommended as second-line drugs for children|
|International Centre for Diarrhoeal Disease Research, Bangladesh 23||Antibiotic treatment for cholera patients with some or severe dehydration||
Ciprofloxacin Azithromycin Cotrimoxazole
Erythromycin recommended as first-line drug for children and pregnant women
|Medicins Sans Frontieres 24||Antibiotic treatment for severely dehydrated patients only||Doxycycline||Erythromycin Cotrimoxazole Chloramphenicol Furazolidone|
* Please note, due to space constraints, dosage information is not included in this table. Dosage guidance can be found by following the website links to the treatment guidance documents provided in the references section below 21-24.
- Over-emphasizing antibiotics for treatment of cholera could divert resources from oral and intravenous rehydration.
- Doxycycline costs approximately $0.02 per 100mg tablet. Azithromycin costs approximately $0.16 per 250mg tablet.
- Antibiotics can cause nausea and vomiting. Gastrointestinal side effects should be carefully monitored, especially in dehydrated patients.
- Antibiotics are not needed and should not be given to patients with cholera who have only mild or no diarrhea and dehydration.
- Prospective surveillance for antibiotic resistance among bacterial isolates from any outbreak is essential for understanding and minimizing the spread of resistance.
- Page last reviewed: January 20, 2015
- Page last updated: January 20, 2015
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