Invasive Listeriosis in a Patient with Penicillin Allergy
Invasive listeriosis ordinarily relies on penicillin-class antibiotics as the backbone of treatment. When the patient carries a documented penicillin allergy, that standard pathway is not available and a different antibiotic strategy must be applied.
Penicillin allergy is the defining factor in this protocol. The presence of this allergy directly determines the antibiotic choice and any applicable substitutions.
In penicillin-allergic patients with invasive listeriosis, trimethoprim-sulfamethoxazole (TMP-SMX) serves as the primary alternative agent. The full protocol specifies the complete regimen, the conditions under which a further alternative applies, and all relevant clinical considerations.
Trimethoprim-sulfamethoxazole as a single agent is a suitable alternative in persons allergic to penicillins.
Vancomycin can be used in penicillin allergic patients when sulfonamides are contraindicated (first trimester and last month of pregnancy, and infants less than 8 weeks of age).
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