Final answer:
The treatment for staphylococcal pharyngitis and UTIs may include trimethoprim-sulfamethoxazole, clindamycin, doxycycline, or linezolid, but ultimately depends on the antibiotic sensitivity of the bacteria. For E. coli UTIs, fluoroquinolones, nitrofurantoin, and cephalosporins are commonly prescribed. Resistant infections require tailored treatments based on sensitivity results.
Step-by-step explanation:
The medication used for the treatment of staphylococcal pharyngitis and urinary tract infections (UTIs) can vary based on the specific bacterial cause and its antibiotic sensitivity profile. For staphylococcal infections, antibiotics such as trimethoprim-sulfamethoxazole (TMP/SMZ), clindamycin, doxycycline, and linezolid are considered, especially if MRSA (methicillin-resistant Staphylococcus aureus) is suspected. For UTIs, particularly those caused by E. coli, common treatments include fluoroquinolones (e.g., ciprofloxacin), nitrofurantoin, and cephalosporins. However, if a patient presents with a UTI caused by a resistant strain, such as carbapenem-resistant Klebsiella pneumoniae, alternative antibiotics must be selected based on sensitivity testing.
In the case provided, Marisa's UTI caused by a resistant strain of Klebsiella pneumoniae did not resolve with ciprofloxacin, indicating that the physician must look for other effective antibiotics identified through laboratory sensitivity testing. It is critical to complete the full prescribed course of antibiotics to prevent the development of further resistance.