Typhoid treatment
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typhoid fever treatment antibiotics
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Typhoid Fever - Treatment
Overview
Typhoid (enteric) fever is caused by Salmonella enterica serotype Typhi (and less commonly, S. Paratyphi). Without treatment, mortality is 10-30%; with prompt appropriate antibiotics it falls to <1%. - Harrison's Principles of Internal Medicine 22E, p.1361
Antibiotic Selection - By Susceptibility Pattern
The choice of antibiotic depends on the susceptibility of the local or travel-acquired strain. A 2022 systematic review of 27 RCTs found no difference between ceftriaxone, fluoroquinolone, or azithromycin in treatment failure, relapse, or adverse events. - Harrison's, p.1361
1. Fully Susceptible Strains
| Agent | Dose | Route | Duration |
|---|---|---|---|
| Ciprofloxacin (optimal) | 500 mg BD | PO | 5-7 days |
| Ciprofloxacin IV | 400 mg q12h | IV | 5-7 days |
| Ceftriaxone (optimal) | 2 g/day | IV | 10-14 days |
| Azithromycin (alternative) | 1 g/day | PO | 5 days |
| Amoxicillin (alternative) | 1 g TID / 2 g q6h | PO/IV | 14 days |
| Chloramphenicol (alternative) | 25 mg/kg TID | PO/IV | 14-21 days |
| TMP-SMX (alternative) | 160/800 mg BD | PO | 7-14 days |
Park's table confirms: fluoroquinolone (ofloxacin/ciprofloxacin) 15 mg/kg/day for 5-7 days is the first-choice for fully susceptible strains. - Park's Textbook of Preventive & Social Medicine, p.279
2. Multidrug-Resistant (MDR) Strains (resistant to ampicillin, chloramphenicol, TMP-SMX)
| Agent | Dose | Duration |
|---|---|---|
| Ceftriaxone | 2 g/day IV | 10-14 days |
| Ciprofloxacin | 500 mg BD PO | 5-7 days |
| Azithromycin | 1 g/day PO | 5-7 days |
| Cefixime (oral alternative) | 15-20 mg/kg/day | 7-14 days |
3. Fluoroquinolone-Resistant / Quinolone-Reduced Susceptibility Strains
Fluoroquinolone resistance is increasing markedly in South Asia, Southeast Asia, and sub-Saharan Africa. Nalidixic acid-resistant S. Typhi predicts clinical fluoroquinolone failure. - Tintinalli's Emergency Medicine, p.
| Agent | Dose | Duration |
|---|---|---|
| Azithromycin | 8-10 mg/kg/day PO | 7 days |
| Ceftriaxone | 75 mg/kg/day IV | 10-14 days |
| Cefixime (alternative) | 20 mg/kg/day | 7-14 days |
4. Extensively Drug-Resistant (XDR) Strains
Since 2016, Pakistan has had a major XDR S. Typhi outbreak resistant to ceftriaxone, ampicillin, ciprofloxacin, and TMP-SMX. Only azithromycin and carbapenems (e.g., meropenem) remain effective. Travelers returning from Pakistan should be specifically assessed for this. - Red Book 2021, p.1023-1024
Empirical Treatment (Awaiting Susceptibility)
When susceptibility data are unavailable:
- Ceftriaxone 2 g/day IV for 10-14 days, OR
- Azithromycin 1 g/day PO for 10 days
Fluoroquinolones should not be used empirically, especially in travelers from South Asia, as most isolates diagnosed in high-income countries are fluoroquinolone-nonsusceptible. - Red Book 2021, p.1023
Severe Typhoid (Meningitis, Shock, Delirium, Coma)
Add high-dose dexamethasone:
- Initial dose: 3 mg/kg IV, then 1 mg/kg IV q6h for a total of 48 hours (8 doses)
- This significantly reduces mortality in shock and severe toxemia
- Reserved for critically ill patients with delirium, obtundation, stupor, coma, or shock
Source: Red Book 2021, p.1024; Tintinalli's, p.
Supportive Care
- IV fluid resuscitation for dehydration
- Blood transfusion if significant GI blood loss
- Antipyretics (paracetamol preferred; avoid aspirin/NSAIDs)
- Nutritional support - soft, easily digestible diet
- Monitoring for complications: bowel perforation, hemorrhage, hepatitis, myocarditis
Surgical Treatment (Bowel Perforation)
Bowel perforation (occurs in ~1-2%) requires emergency surgery: laparotomy with primary repair or resection + anastomosis, combined with IV antibiotics covering gram-negative organisms. - Bailey and Love's Surgery, 28th Ed.
Treatment of Chronic Carriers (>3 months excretion post-illness)
| Situation | Regimen |
|---|---|
| Fluoroquinolone-susceptible | Ciprofloxacin or other fluoroquinolone PO x 4 weeks (~80% eradication) |
| Fluoroquinolone-resistant | Azithromycin PO x 4 weeks (limited data) |
| Ampicillin-susceptible | High-dose amoxicillin + probenecid x 6 weeks |
| Anatomic abnormality (gallstones) | Antibiotics + cholecystectomy |
- Harrison's, p.1362; Red Book 2021, p.1024; Park's, p.279
Pediatric Considerations (Red Book 2021)
- Optimal duration: at least 7-10 days for uncomplicated disease
- Amoxicillin/TMP-SMX: use 14-day course if susceptible
- Corticosteroids for severe disease: dexamethasone 3 mg/kg IV initial dose, then 1 mg/kg q6h x 8 doses total
- Relapse rate is lower with azithromycin compared to fluoroquinolones or ceftriaxone (up to 17% relapse possible within 4 weeks)
Summary - Quick Drug Choice Guide
| Clinical Situation | Drug of Choice |
|---|---|
| Uncomplicated, susceptible strain | Ciprofloxacin or ceftriaxone |
| MDR typhoid | Ceftriaxone or azithromycin |
| Quinolone-resistant | Azithromycin or ceftriaxone |
| XDR typhoid (Pakistan travel) | Azithromycin or carbapenem |
| Severe/shocked patient | Ceftriaxone/azithromycin + dexamethasone |
| Chronic carrier | Ciprofloxacin x 4 weeks |
| Carrier with gallstones | Antibiotic + cholecystectomy |
Recent evidence note (2024): A systematic review (PMID 39623850) found azithromycin comparable to other antimicrobials across all age groups in uncomplicated typhoid based on RCTs - supporting its use especially where fluoroquinolone/cephalosporin resistance is a concern.
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