The patient is diagnosed with a severe urinary tract infection (pyelonephritis), and you decide to prescribe him sulfamethoxazole/trimethoprim (SMX/TMP) 800/160mg one tab PO Q12h x14 days Over the next couple of weeks, the symptoms associated with his UTI diminish, and his mental status improves. However, Ms. Webb brings him back to your clinic with symptoms, which scare her yet again, and she explains that she thinks he may have a relapse of his UTI. These symptoms include a high fever (103.6°F) and tachypnea, and upon pulmonary examination at your clinic, you hear crackles, and find classic findings of lung consolidation.