Management of Group A Streptococcus Infections

First-Line Antibiotic Treatment

The American Academy of Pediatrics and the Infectious Diseases Society of America recommend oral penicillin V or amoxicillin for 10 days as first-line therapy for Group A Streptococcus pharyngitis due to its proven efficacy, safety, narrow spectrum, and low cost 1, 2
For patients without penicillin allergy, oral penicillin V is the gold standard, with children receiving 250 mg twice or three times daily, and adolescents and adults receiving 250 mg four times daily or 500 mg twice daily for 10 days 1, 2
For patients without penicillin allergy, oral amoxicillin is equally effective and often preferred in young children due to better taste acceptance, with a dosage of 50 mg/kg once daily (maximum 1000 mg) or 25 mg/kg twice daily (maximum 500 mg) for 10 days 1, 2
For patients with penicillin allergy, first-generation cephalosporins (e.g., cephalexin) can be used for 10 days in patients without immediate-type hypersensitivity 1, 2
For patients with immediate hypersensitivity to β-lactams, clindamycin can be used for 10 days 1, 2

The Infectious Diseases Society of America recommends a 10-day treatment course with oral antibiotics to achieve maximal pharyngeal eradication and prevent acute rheumatic fever 3, 4

The primary treatment goal is to prevent acute rheumatic fever, which is the most critical for mortality and morbidity 3, 4, 2
The second treatment goal is to prevent suppurative complications, such as peritonsillar abscess, cervical lymphadenitis, and mastoiditis 3, 4, 2

The American Academy of Pediatrics recommends treating recurrent episodes with the same antimicrobial agents appropriate for initial illness 3, 4
For multiple recurrences, consider clindamycin or amoxicillin/clavulanate as they achieve higher pharyngeal eradication rates in carrier states 3, 4

The Infectious Diseases Society of America recommends that GAS carriers do not require identification efforts or antimicrobial therapy, as they are unlikely to spread infection or develop complications 1, 2

The American Academy of Pediatrics recommends not routinely testing or treating asymptomatic household contacts, as approximately 25% of household contacts harbor GAS asymptomatically but are at low risk for complications 5

Never use shorter antibiotic courses (<10 days for oral therapy) despite some literature suggesting efficacy, as this increases the risk of rheumatic fever 3, 4
Avoid cephalosporins in patients with immediate-type hypersensitivity to penicillin 1, 2
Do not routinely retest asymptomatic patients after treatment completion, as this leads to unnecessary retreatment of carriers 3, 4, 5
Be aware of macrolide resistance, which varies geographically and temporally, when selecting azithromycin or clarithromycin 1, 2