A 9-year-old boy presents with a one-week history of high-grade fever, headache, and abdominal pain. He recently returned from a family trip to an urban area in Pakistan. A blood culture is obtained, and enteric fever is suspected. Based on recent global resistance patterns, what is the most appropriate empiric oral antimicrobial therapy for this uncomplicated presentation?
A 12-year-old boy is hospitalized with pneumonia caused by Mycoplasma pneumoniae. During his illness, he develops severe oral mucositis with hemorrhagic crusting of the lips, purulent conjunctivitis, and urethritis, but only a few targetoid lesions on his trunk. For this severe mucocutaneous manifestation, what adjunctive therapy is most appropriate to consider in addition to antibiotics?
A 4-year-old child with perinatally acquired HIV is being seen for a well-child check. The most recent laboratory results show a CD4+ T-lymphocyte count of 350 cells/μL and a CD4 percentage of 12%. The child is due for routine immunizations. Which of the following vaccines is specifically contraindicated for this child?
A family is planning a 2-week trip to a malaria-endemic area in Africa. For their 12-year-old child (40 kg), the physician prescribes atovaquone/proguanil for prophylaxis. What is a key advantage of this regimen related to the duration of use?
A 12-year-old boy presents with a 3-day history of fever, right lower quadrant abdominal pain, vomiting, and watery diarrhea. An abdominal ultrasound reveals significant mesenteric lymphadenitis and thickening of the terminal ileum. At presentation, he is also noted to have a prominent exudative pharyngitis. Which organism is most likely responsible for this constellation of findings?
An 11-year-old boy presents with a 3-day history of high fever, severe headache, and myalgias. He reports no rash. His symptoms resolved completely, but he returns to the clinic 6 days later with an identical recurrence of high fever. The family went on a camping trip in the mountains of Colorado two weeks ago. What is the most likely finding on a Wright-stained peripheral blood smear obtained during a febrile episode?
A 5-year-old girl, recovering from a recent influenza infection, presents with a sudden onset of severe, bilateral calf pain and refuses to walk. Her mother notes that her urine has appeared dark for the last day. On examination, she has marked tenderness of her calf muscles. This clinical presentation is most consistent with which complication of influenza?
A 16-year-old presents with classic symptoms of muscle-stage trichinellosis, including periorbital edema, myalgia, and fever, three weeks after eating undercooked wild boar meat. Eosinophilia is present. What is the role of corticosteroids in the management of this stage?
A 14-year-old with cystic fibrosis is chronically colonized with a mucoid strain of Pseudomonas aeruginosa. During a routine clinic visit while he is stable, his pulmonologist considers adding a long-term oral medication to his regimen. Which class of medication has been shown to decrease the frequency of pulmonary exacerbations in this patient population by altering bacterial virulence properties rather than by direct bactericidal activity?
A 10-year-old boy with a known congenital bicuspid aortic valve is diagnosed with culture-negative endocarditis. He has a history of visiting his grandparents’ goat farm several months prior to the onset of his symptoms. Serologic testing is performed. Which of the following serologic profiles would be most characteristic of his condition?
