Transcription 12/15/2025, 8:48:42 PM

Apuntes

• Subtopic: Susceptibility to Haemophilus influenzae infection A 3-year-old boy is brought to the office due to a 1-day history of fever and irritability. The mother states that the boy has been tugging at his right ear. The patient has had 2 previous episodes of acute otitis media. His temperature is 38.1°C (100.6°F). Otoscopic examination shows a perforated right tympanic membrane with erythema and purulent exudate. Cultures from the exudate yield small, oxidase-positive, gram-negative coccobacilli that grow on factor X- and factor V-supplemented media, consistent with *Haemophilus influenzae*. The patient's immunizations are up to date. Which of the following best explains this patient's susceptibility to the pathogen causing his current infection? A. No vaccine is effective against *H. influenzae* (4%) B. The patient has defective cell-mediated immunity (19%) C. The patient has defective neutrophil function (11%) D. The strain responsible for this patient's disease does not produce a capsule (59%) E. The strain responsible for this patient's disease produces exotoxin (6%) **Correct answer: E** --- • Subtopic: Prevention of rabies in a high-risk student A 17-yea...