Group A Streptococcal Pharyngitis (Strep Throat) Treatment Plan
Group A streptococcal (GAS) pharyngitis should be treated with antibiotics after confirmation by a positive rapid antigen detection test (RADT) or throat culture [1]. Viral pharyngitis should not be treated with antibiotics [1]. Antibiotic treatment shortens symptom duration and reduces transmission [1].
Diagnostic Test Confirmation Before Antibiotics
RADT or throat culture confirmation is required for GAS pharyngitis [1]. Children aged ≥3 years with a negative RADT should have a throat culture backup with a mechanism to start antibiotics if the culture is positive [1]. Clinical examination alone is not adequate to distinguish viral from GAS pharyngitis when viral symptoms are absent [1].
First-Line Antibiotic Dosing Regimens (No Penicillin Allergy)
Penicillin or amoxicillin is recommended as first-line therapy [1].
Penicillin V (oral)
- Children: 250 mg twice daily or 3 times daily for 10 days [1].
- Adolescents and adults: 250 mg 4 times daily or 500 mg twice daily for 10 days [1].
Amoxicillin (oral)
- 50 mg/kg once daily (maximum 1000 mg) for 10 days [1].
- Alternate: 25 mg/kg (maximum 500 mg) twice daily for 10 days [1].
Benzathine Penicillin G (IM) (single dose option)
- Weight <27 kg: 600,000 units IM once [1].
- Weight ≥27 kg: 1,200,000 units IM once [1].
Penicillin Allergy Treatment Dosing
For penicillin allergy, one of the CDC-recommended alternative regimens should be selected [1].
Avoidance in immediate-type penicillin hypersensitivity
Cephalexin and cefadroxil should be avoided in patients with immediate-type hypersensitivity to penicillin [1].
Recommended alternatives (CDC)
- Cephalexin (oral): 20 mg/kg/dose twice daily (maximum 500 mg/dose) for 10 days [1].
- Cefadroxil (oral): 30 mg/kg once daily (maximum 1 g) for 10 days [1].
- Clindamycin (oral): 7 mg/kg/dose 3 times daily (maximum 300 mg/dose) for 10 days [1].
- Azithromycin (oral): 12 mg/kg once (maximum 500 mg), then 6 mg/kg (max 250 mg) once daily for 4 additional days [1].
- Clarithromycin (oral): 7.5 mg/kg/dose twice daily (maximum 250 mg/dose) for 10 days [1].
Treatment Initiation Thresholds and Practical Timing
Antibiotics should be initiated for patients with positive RADT or positive throat culture [1]. Symptom onset is typically 2–5 days after exposure [1]. Antibiotic therapy should start promptly once confirmation is obtained [1].
Contagiousness, Exclusion, and Follow-Up
Patients with GAS pharyngitis should stay home from work, school, or daycare until afebrile and until at least 12–24 hours after starting appropriate antibiotics [1]. Duration should follow CDC-recommended regimens (typically 10 days for oral penicillin/amoxicillin and most alternatives) [1].
Supportive Care and When to Reassess
Supportive management for pain and fever should be provided while antibiotics are being administered [1]. Reassessment is indicated for worsening or suspected complications such as peritonsillar abscess or deep neck infection symptoms [1].