What is the appropriate management for acute tonsillitis?

Management of Acute Tonsillitis

For acute tonsillitis, use clinical scoring systems (Centor/McIsaac) to identify bacterial cases requiring antibiotics, prescribe penicillin V or amoxicillin for 10 days when Group A Streptococcus is confirmed, and provide symptomatic relief with analgesics—most cases are viral and require only supportive care. 1

Diagnostic Approach

Clinical Assessment

• Apply the Centor or McIsaac scoring system to estimate the probability of Group A Streptococcal (GAS) infection 1, 2
• A score ≥3 warrants further testing with rapid antigen detection test (RADT) or throat culture 2, 3
• Do not rely on exudate alone—exudative tonsillitis in children does not reliably indicate streptococcal etiology 3

Laboratory Testing

• Perform pharyngeal swab with RADT or culture only when clinical score is ≥3 1, 2
• Routine blood tests (CBC, CRP, procalcitonin) are not indicated for uncomplicated acute tonsillitis and do not change management 2, 3
• Do not measure antistreptolysin O (ASLO) titers—they have no value in acute tonsillitis diagnosis 2

Antibiotic Therapy (When Indicated)

First-Line Treatment for Confirmed GAS

Penicillin V remains the antibiotic of choice for GAS pharyngitis 1, 2:

• Children: 250 mg twice or three times daily for 10 days 1
• Adolescents/Adults: 250 mg four times daily or 500 mg twice daily for 10 days 1
• Alternative: Amoxicillin 50 mg/kg once daily (max 1000 mg) or 25 mg/kg twice daily (max 500 mg/dose) for 10 days 1
• Intramuscular option: Benzathine penicillin G as single dose (<27 kg: 600,000 U; ≥27 kg: 1,200,000 U) 1

Penicillin Allergy Alternatives

• First-generation cephalosporins (avoid in immediate-type hypersensitivity): Cephalexin 20 mg/kg/dose twice daily (max 500 mg/dose) for 10 days 1
• Clindamycin: 7 mg/kg/dose three times daily (max 300 mg/dose) for 10 days 1
• Macrolides (note geographic resistance): Azithromycin 12 mg/kg once daily (max 500 mg) for 5 days or clarithromycin 7.5 mg/kg/dose twice daily (max 250 mg/dose) for 10 days 1

Treatment Duration

The full 10-day course is essential—a 7-day penicillin regimen was superior to 3 days in resolving symptoms 1, and 10-day courses reduce recurrence risk 4

When NOT to Prescribe Antibiotics

• Most tonsillitis is viral and requires only supportive care 5
• Low-risk patients (Centor/McIsaac score <3) should not receive antibiotics for prevention of rheumatic fever or glomerulonephritis 3
• Prevention of suppurative complications (peritonsillar abscess, otitis media, lymphadenitis) is not a specific indication for antibiotics in most patients 3
• Consider delayed antibiotic prescription strategy—monitor for 2-3 days in ambiguous cases, which is highly effective and reduces antibiotic use 3

Symptomatic Management

Analgesia

• Paracetamol (acetaminophen) and NSAIDs are effective for pain relief 1, 6
• Use codeine with caution in pediatric patients 6
• Topical anesthetics (lozenges, sprays with benzocaine, lidocaine) may provide temporary relief but represent choking hazard in young children 1

Corticosteroids

Moderate evidence supports single-dose corticosteroid administration for symptom relief, followed by reassessment 6. However, the IDSA guideline does not recommend routine corticosteroid use given the self-limited nature of GAS pharyngitis, efficacy of analgesics, and potential adverse effects 1

Supportive Care

• Hydration 5
• Warm salt water gargles (though not formally studied) 1

Follow-Up and Carrier State

Post-Treatment Testing

• Do not perform routine post-therapy testing (throat culture, blood tests, urinalysis, ECG, or ASLO titers) after successful treatment 1, 2
• Only retest patients with recurrent symptoms within weeks to months 1

GAS Carriers

• Chronic pharyngeal carriers do not require identification or treatment—they are unlikely to spread infection or develop complications 1
• Up to 20% of asymptomatic school-age children may be GAS carriers during winter/spring 1
• Consider carrier state in patients with repeated positive tests and viral symptoms 1

Surgical Considerations

Tonsillectomy is NOT recommended solely to reduce frequency of GAS pharyngitis 1. However, tonsillectomy is indicated for recurrent acute tonsillitis meeting Paradise criteria: ≥7 adequately treated episodes in the preceding year, ≥5 episodes in each of the preceding 2 years, or ≥3 episodes in each of the preceding 3 years 4. Recent evidence shows tonsillectomy reduces sore throat days by approximately 47% compared to conservative management in adults with recurrent tonsillitis 7.

Key Clinical Pitfalls

• Avoid antibiotic overuse: Most tonsillitis is viral; use scoring systems and confirmatory testing 1, 3
• Complete the full 10-day antibiotic course when prescribed to prevent recurrence 4
• Do not use macrolides as first-line therapy—resistance varies geographically and temporally 1, 2
• Avoid unnecessary testing: No routine blood work, ASLO titers, or post-treatment cultures 1, 2