A 9-year-old boy presents to the emergency department with a 4-day history of fever, productive cough, and right-sided pleuritic chest pain. His mother reports he had symptoms of rhinitis and pharyngitis 1 week prior that were improving. On physical examination, temperature is 38.9°C, respiratory rate is 28/min, and heart rate is 110/min. Chest auscultation reveals decreased breath sounds and dullness to percussion in the right lower lobe. Laboratory studies show a positive rapid antigen detection test for Group A Streptococcus from a throat swab obtained 3 days ago. Chest X-ray demonstrates right lower lobe consolidation with a small parapneumonic pleural effusion. Which of the following organisms is most likely responsible for this patient's pneumonia?
- A)Haemophilus influenzae type b
- B)Staphylococcus aureus
- C)Group A StreptococcusGABARITO
- D)Streptococcus pneumoniae
- E)Mycoplasma pneumoniae
Explicação
Group A Streptococcus (GAS) is the most likely organism. The clinical presentation is highly suggestive: recent documented pharyngitis (positive rapid strep test 3 days ago), acute progression to pneumonia with pleural effusion, and classic consolidation on im... Ver explicação completa e trilha adaptativa →