Treatment of cholera
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Treatment of Cholera
Cholera is caused by Vibrio cholerae O1 or O139, and its treatment rests on two pillars: rehydration (primary and life-saving) and antibiotics (adjunctive, reduces disease burden). With proper treatment, mortality falls from 50-75% to less than 1%. - Sleisenger & Fordtran's Gastrointestinal and Liver Disease, p. 148
1. Assessment of Dehydration
On arrival, classify the patient:
| Degree | Features |
|---|---|
| Mild | Thirsty, alert, normal BP, normal pulse |
| Moderate | Restless/irritable, sunken eyes, decreased skin turgor, thready pulse |
| Severe | Lethargic/unconscious, unable to drink, very sunken eyes, no urine - requires IV fluids urgently |
2. Rehydration Therapy
Rehydration is the cornerstone of treatment. Cholera stool is rich in Na⁺ (~130 mEq/L), Cl⁻ (~100 mEq/L), K⁺ (~20 mEq/L), and HCO₃⁻ (~44 mEq/L) - the replacement fluid must mirror this composition. Treatment occurs in two phases: - Goldman-Cecil Medicine, Table 278-2
Phase 1: Rehydration Phase (2-4 hours)
Intravenous route is used in:
- All severely dehydrated patients: total volume = 100 mL/kg
- Adults/children >1 year: infuse 30 mL/kg in the first 30 minutes, then remaining 70 mL/kg over 2.5 hours
- Children <1 year: infuse the initial 30 mL/kg over 1 hour
- Patients with moderate dehydration who cannot tolerate oral fluids
- Patients with very high stool output (>10 mL/kg/hour)
Preferred IV fluid: Lactated Ringer's solution (Na⁺ 130, Cl⁻ 109, K⁺ 4, lactate 28, osmolarity 271). Normal saline is a second choice but lacks potassium and bicarbonate.
Oral Rehydration Solutions (ORS) for mild-to-moderate cases:
- WHO standard ORS: Na⁺ 90, K⁺ 20, glucose 111 mEq/L, osmolarity ~311 mOsm/L
- WHO reduced-osmolarity ORS (preferred by WHO for all diarrheal diseases): Na⁺ 75, K⁺ 20, glucose 75, osmolarity 245 mOsm/L
- Rice-based ORS: similar electrolyte composition; the addition of L-histidine to rice-based ORS reduces diarrhea volume and duration in adults
Note: Low-osmolarity solutions are NOT recommended during the high-output phase of severe cholera.
Phase 2: Maintenance Phase (until diarrhea stops)
- Replace ongoing losses orally with ORS: typically 800-1000 mL/hour may be required during peak diarrhea
- Monitor input/output with predesigned charts
- The goal: all dehydration signs resolved, urine output ≥ 0.5 mL/kg/hour (or ≥40 mL/hour in adults)
Discharge criteria: Adequate oral tolerance (≥1000 mL/hr), satisfactory urine output (≥40 mL/hr), and low stool volume (≤400 mL/hr). - Goldman-Cecil Medicine, Table 278-2
3. Antimicrobial Therapy
Antibiotics are adjuncts - they reduce stool output and duration of diarrhea by nearly half, shorten illness, and reduce Vibrio shedding, but they are NOT life-saving on their own. Start antibiotics only after full rehydration is achieved and oral tolerance is confirmed (vomiting has stopped, usually after 3-4 hours of ORT). - Park's Textbook of Preventive and Social Medicine, p. 275
Antibiotic Regimens
| Patient Group | Drug | Dose & Duration |
|---|---|---|
| Non-pregnant adults | Doxycycline (preferred) | 300 mg single oral dose |
| Non-pregnant adults (alt) | Ciprofloxacin | 1 g single oral dose |
| Non-pregnant adults (alt) | Norfloxacin | 400 mg twice daily x 3 days |
| Non-pregnant adults (alt) | Azithromycin | 1 g single dose |
| Pregnant women | Azithromycin | 1 g single oral dose |
| Pregnant women (alt) | Erythromycin | 100 mg 4x/day for 3 days |
| Pregnant women (alt) | Furazolidone | 500 mg 4x/day for 3 days |
| Children | Azithromycin | 20 mg/kg single dose (max 1 g) |
| Children (alt) | Erythromycin | 100 mg 4x/day x 3 days |
- Sleisenger & Fordtran's, p. 152; Goldman-Cecil Medicine, p. 278; Jawetz Melnick & Adelberg's Medical Microbiology, p. 268
Tetracycline (500 mg four times daily for 3 days) has historically shown excellent efficacy, superior to furazolidone and chloramphenicol, but resistance is now widespread, particularly in endemic areas where resistance genes are carried on transmissible plasmids. Antibiotic choice should always be guided by local susceptibility patterns.
Antibiotics to Avoid
Antidiarrheal agents (loperamide, diphenoxylate), antiemetics, antispasmodics, adsorbents, analgesics, antisecretory drugs, cardiotonics, and corticosteroids are not useful and should not be given. - Park's Textbook, p. 275; Goldman-Cecil Medicine
Antimicrobial Resistance
- Fluoroquinolone resistance is an increasing concern globally
- If diarrhea persists after 48 hours of antibiotic treatment, antibiotic resistance should be suspected
- Mass antibiotic prophylaxis in asymptomatic contacts is a risk factor for emergence of resistance
4. Adjunctive Measures
- Zinc supplementation (30 mg/day): Shown in children (Bangladesh) to reduce the duration of diarrhea by 12% and volume by an additional 11% when added to antibiotic therapy. Useful adjunct in pediatric cholera. - Sleisenger & Fordtran's, p. 152
- Potassium and bicarbonate: Pay particular attention to replacement, as these are disproportionately lost in choleric stools causing hypokalemic acidosis.
- Injectable antibiotics offer no special advantage over oral antibiotics.
5. Special Populations
| Population | Note |
|---|---|
| Children | Mortality 3-5% (limited fluid reserves); azithromycin 20 mg/kg preferred; zinc supplementation useful |
| Pregnant women | Azithromycin 1 g or erythromycin preferred; avoid tetracyclines and fluoroquinolones |
| Severe dehydration / shock | IV Ringer's lactate mandatory; do NOT delay for labs or other treatments |
6. Monitoring and Discharge
- Register and periodically review input/output using predesigned charts
- After the rehydration phase: all signs of dehydration should resolve, urine output ≥ 0.5 mL/kg/hr
- Discharge when: oral tolerance adequate, urine output satisfactory, stool volume low
Sources: Goldman-Cecil Medicine International Edition (2 Vol Set), Table 278-2 | Sleisenger & Fordtran's Gastrointestinal and Liver Disease, Ch. 110 | Park's Textbook of Preventive and Social Medicine, p. 274-275 | Jawetz Melnick & Adelberg's Medical Microbiology 28E, p. 268-269
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