Treatment of Resistant Streptococcal Infections

Introduction to Resistant Streptococcal Infections

The combination of clindamycin and penicillin is the most effective treatment for resistant streptococcal infections, particularly for severe infections like necrotizing fasciitis caused by Group A streptococci, according to the Infectious Diseases Society of America 1

For penicillin treatment failures or suspected resistant strep pharyngitis, clindamycin (20-30 mg/kg/day in three doses, maximum 300 mg per dose for 10 days) is the most effective option with strong evidence, as recommended by the American Academy of Family Physicians 2
Alternative regimens for chronic carriers or resistant cases include penicillin with rifampin combination, amoxicillin-clavulanate, and penicillin G benzathine with oral rifampin, as suggested by the American Academy of Family Physicians 2
For patients with penicillin allergy who cannot take clindamycin, macrolides such as azithromycin and clarithromycin may be used, but resistance should be considered, according to the American Academy of Family Physicians 2
The combination of clindamycin plus penicillin is recommended for necrotizing fasciitis or streptococcal toxic shock syndrome, as stated by the Infectious Diseases Society of America 1, 3

For patients with severe penicillin hypersensitivity and invasive streptococcal infections, options include vancomycin, linezolid, quinupristin/dalfopristin, and daptomycin, as recommended by the Infectious Diseases Society of America 1

Surgical drainage is essential for abscesses, and for complicated skin/soft tissue infections, vancomycin, linezolid, daptomycin, or clindamycin are recommended, according to the Infectious Diseases Society of America 4, 5, 6

For complicated skin/soft tissue infections, the duration of therapy is 7-14 days based on clinical response, as suggested by the Infectious Diseases Society of America 6
Tetracyclines should not be used in children under 8 years of age, and for children with complicated infections, clindamycin or vancomycin is recommended, according to the Infectious Diseases Society of America 6
Penicillin remains the drug of choice for non-resistant streptococcal infections due to no documented resistance, narrow spectrum, and low cost, as stated by the Infectious Diseases Society of America 7
Rifampin should not be used as monotherapy due to rapid development of resistance, as recommended by the Infectious Diseases Society of America 6