Management of Penicillin-Refractory Sore Throat with Lymphoid Hypertrophy

Understanding Penicillin Failure

True penicillin resistance in group A streptococci has never been documented anywhere in the world, and failure is due to protective mechanisms rather than inherent bacterial resistance, as stated by the Infectious Diseases Society of America 3, 2

For penicillin-allergic or penicillin-failure patients, clindamycin is the preferred agent because it effectively eradicates throat carriage when first-line penicillin therapy has been unsuccessful, according to the Journal of Infection guidelines 1
Clindamycin dosing is 300 mg four times daily for 10 days in adults, as recommended by the Journal of Infection 1
First-generation cephalosporins (e.g., cephalexin) are acceptable alternatives for patients without immediate hypersensitivity to beta-lactams, and a standard 10-day course is required, as stated by the Clinical Infectious Diseases guidelines 2
Macrolides (clarithromycin or azithromycin) are third-line options, with clarithromycin 250 mg twice daily for 10 days and azithromycin 500 mg once daily for 5 days, as recommended by the Clinical Infectious Diseases guidelines 2
Less than 5% of group A streptococci in North America show erythromycin resistance, according to the Clinical Infectious Diseases guidelines 3

Amoxicillin or ampicillin should be avoided in penicillin-failure cases because they are penicillin congeners and will fail for the same reasons as penicillin V, as stated by the Clinical Infectious Diseases guidelines 3
Tetracyclines should be avoided due to high prevalence of resistant strains, as recommended by the Clinical Infectious Diseases guidelines 2
Sulfonamides/trimethoprim-sulfamethoxazole should be avoided because they do not eradicate group A streptococci, according to the Clinical Infectious Diseases guidelines 2
Older fluoroquinolones (ciprofloxacin) should be avoided due to limited activity against group A streptococci, as stated by the Clinical Infectious Diseases guidelines 2

For patients with multiple repeated culture-positive episodes, amoxicillin-clavulanate becomes the preferred choice, with dosing of 40 mg/kg/day (amoxicillin component) in 3 divided doses for 10 days in children, as recommended by the American Academy of Pediatrics, although the citation is from Praxis Medical Insights, an alternative source is not provided 4

Broad-spectrum agents should not be used as first-line, but rather reserved for documented failure cases to minimize resistance and adverse effects, as recommended by the Clinical Infectious Diseases guidelines 2
Household contacts should not be ignored, and reexposure to infected family members can cause apparent treatment failure; consider screening and treating close contacts if recurrence is frequent, as stated by the Journal of Infection guidelines 1