What is the recommended treatment for suspected or confirmed typhoid fever in adults and children?

Treatment of Typhoid Fever

Azithromycin 500 mg once daily for 7 days in adults (or 20 mg/kg/day for 7 days in children, maximum 1 g/day) is the preferred first-line treatment for suspected or confirmed typhoid fever, particularly in cases originating from South Asia where fluoroquinolone resistance exceeds 70%. 1

First-Line Empiric Therapy

• Start azithromycin immediately as empiric therapy for all suspected typhoid fever cases, especially those with travel history to South Asia, where fluoroquinolone resistance approaches 96% in some regions 1
• Azithromycin reduces clinical failure by 52% compared to fluoroquinolones (OR 0.48,95% CI 0.26–0.89) 1, 2
• Hospital stay is shortened by approximately 1 day versus fluoroquinolones (mean difference −1.04 days) 1, 2
• Relapse risk is 91% lower with azithromycin compared to ceftriaxone (OR 0.09,95% CI 0.01–0.70) 1, 2
• Azithromycin retains activity against multidrug-resistant strains (resistant to chloramphenicol, ampicillin, and trimethoprim-sulfamethoxazole) 1

Specific Dosing Regimens

Adults:

• Azithromycin: 500 mg orally once daily for 7 days 1
• Ceftriaxone (if IV therapy needed): 1–2 g IV/IM daily for 5–7 days 1

Children:

• Azithromycin: 20 mg/kg/day orally once daily for 7 days (maximum 1 g/day) 1
• Ceftriaxone: 50–80 mg/kg/day IV/IM for 5–7 days (maximum 2 g/day) 1

Alternative Therapy: When to Use Ceftriaxone

• Use ceftriaxone as first-line when the patient requires intravenous therapy due to severe illness, inability to tolerate oral medications, or sepsis features 1
• Ceftriaxone reduces treatment-failure risk compared to gatifloxacin in culture-confirmed cases (hazard ratio 0.24,95% CI 0.08–0.73) 1
• Ceftriaxone may result in decreased clinical failure compared to azithromycin, though the evidence is of low certainty 3
• Time to defervescence with ceftriaxone is approximately 0.5 days shorter than azithromycin (mean difference −0.52 days) 1

When Fluoroquinolones May Be Considered

Fluoroquinolones should only be used when ALL of the following criteria are met:

• Culture demonstrates nalidixic acid susceptibility 1
• The infection was NOT acquired from South or Southeast Asia 1
• Susceptibility is confirmed by laboratory testing 1

Never use ciprofloxacin empirically for cases from South or Southeast Asia due to resistance rates approaching 96% 1

Diagnostic Priorities Before Treatment

• Obtain blood cultures immediately before starting antibiotics whenever possible; they provide the highest diagnostic yield (sensitivity 40–80%) within the first week of symptom onset 1
• For patients presenting with sepsis features, start broad-spectrum antimicrobial therapy immediately after blood cultures are drawn 1
• Stool and urine cultures become positive only after the first week of illness 1
• Do not use the Widal serologic test due to inadequate sensitivity and specificity 1

Expected Clinical Response & Monitoring

• Fever should resolve within 4–5 days of appropriate azithromycin therapy 1
• Mean fever-clearance time is 5.8 days (95% CI 5.1–6.5) 1
• If no clinical improvement by day 5, consider antimicrobial resistance or alternative diagnosis 1
• Complete the full 7-day course even if fever resolves early; premature discontinuation increases relapse risk, which occurs in 10–15% of inadequately treated cases 1

Critical Pitfalls to Avoid

• Never discontinue antibiotics prematurely; completing the full 7-day course is essential to prevent relapse 1
• Never use ciprofloxacin empirically for travel-associated cases from South or Southeast Asia 1
• Avoid cefixime as first-line therapy; it has treatment failure rates of 4–37.6% and performs 13-fold worse than fluoroquinolones (RR 13.39,95% CI 3.24–55.39) 1, 3
• If cefixime must be used, a mandatory test-of-cure at 1 week is required due to high failure rates 1

Special Populations

Pregnancy:

• Azithromycin is FDA Pregnancy Category B and may be used safely in pregnant patients 1
• Fluoroquinolones are contraindicated in pregnancy 1

Adverse Effects

• Azithromycin is generally well tolerated; most common adverse effects are mild gastrointestinal symptoms (nausea, vomiting, abdominal pain, diarrhea) 1
• Monitor for QT-prolonging drug interactions when prescribing azithromycin 1

Management of Complications

Intestinal Perforation:

• Occurs in 10–15% of patients with illness duration exceeding 2 weeks 1
• Surgical intervention is required: simple excision and closure achieves approximately 88% success rate 1
• Primary repair is recommended for a single perforation with minimal peritoneal contamination 1
• Resection with primary anastomosis is advised for multiple perforations or unhealthy bowel tissue 1

Other Severe Complications:

• Gastrointestinal bleeding and typhoid encephalopathy affect 10–15% of patients with prolonged untreated illness 1

Resistance Patterns to Consider

• More than 70% of Salmonella Typhi isolates from South and Southeast Asia are fluoroquinolone-resistant 1
• Extensively drug-resistant (XDR) strains have emerged in Pakistan, resistant to all first-line agents except azithromycin and carbapenems 4
• Azithromycin resistance is emerging in some regions, though it remains rare 5
• Always consider local resistance patterns when selecting empiric therapy 1