A 22-year-old man presented to the hospital with fever for 4 days. He also complained of myalgia and sore throat. His blood pressure was 110/70 mmHg, pulse rate 90/min, respiratory rate 20/min, and body temperature 39.2 ℃. Multiple cervical lymph nodes were palpable bilaterally and were tender to touch. The lesions were as shown in Figure A. The blood test results were as follows. What is the appropriate treatment?

A 54-year-old man presented with fever and back pain. The pain had acutely worsened the day before, to the point where he could no longer stand up. He reported experiencing occasional back pain in the past and had undergone acupuncture multiple times. His vital signs were: blood pressure 100/70 mmHg, heart rate 120 beats per minute, respiratory rate 20 breaths per minute, and body temperature 38.9℃. Lumbar spine MRI is shown (Figure A). Considering the Gram stain findings from a blood sample (Figure B), which antibiotic would be appropriate?

A 27-year-old man presented to the hospital with a painful, indurated swelling on the occipital scalp that began a week ago. This morning, purulent discharge began oozing from the area. He reported a habitual tendency to scratch his scalp due to frequent itching. He had been taking an antibiotic prescribed by a nearby clinic for the past four days, which was identified as cephradine (a first-generation cephalosporin). Which empirical antibiotic would be most appropriate to use before the culture results become available?

A 20-year-old man presented to the hospital with fever as his chief complaint. He had recently returned from a trip to Laos two weeks prior. On physical examination, a skin rash was noted (Figure A), and laboratory results are shown in Figure B. What is the appropriate treatment?