Management of Persistent Symptoms After Initiating Amoxicillin for Strep Pharyngitis

Clinical Considerations

The Infectious Diseases Society of America (IDSA) guidelines state that cough, congestion, and similar respiratory symptoms suggest a viral cause rather than bacterial infection in patients with strep pharyngitis 1
Up to 20% of school-aged children are chronic GAS carriers during winter and spring months, and these carriers can experience intercurrent viral infections that produce new symptoms while still harboring streptococci in their pharynx 1, 2
True treatment failure with amoxicillin for strep pharyngitis is rare 3
Carriers are at very low risk for complications, including rheumatic fever, and are unlikely to spread infection to contacts 1, 2

The American Academy of Pediatrics and the IDSA recommend discontinuing antibiotics and providing supportive care only for patients with persistent symptoms after initiating amoxicillin for strep pharyngitis, as continuing antibiotics for what is likely a viral infection provides no benefit and increases adverse effects and resistance 1, 4
Ibuprofen or acetaminophen can be used for fever and discomfort, with ibuprofen providing superior pain relief 4
Avoid aspirin due to Reye syndrome risk 4
Supportive care for viral upper respiratory symptoms is recommended 1

The IDSA guidelines recommend considering alternative antibiotic therapy only if symptoms clearly worsen after initial improvement, fever and pharyngeal symptoms persist beyond 10 days without improvement, or the patient develops severe symptoms 5
If retreatment is deemed necessary, any agent from the standard treatment table is appropriate, and intramuscular benzathine penicillin G can be considered if compliance with oral therapy is questionable 1, 6
For documented multiple recurrences, clindamycin or amoxicillin-clavulanate can be considered as these achieve higher carrier eradication rates 1, 6, 2

True treatment failure with penicillin is actually rare despite bacteriologic failure rates of 20-30%, because many "failures" represent carrier states, as reported by the Clinical Infectious Diseases journal 7
While bacteriologic failure rates have increased from 2-10% historically to approximately 30% currently, this does not mean clinical failure, according to the Clinical Infectious Diseases journal 7