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Difficulty: MediumPediatric Infectious Diseases

Match each pediatric patient's clinical presentation to the most likely causative pathogen.

  • A 5-week-old infant presents with a 2-week history of a distinctive staccato cough, tachypnea, and no fever. Laboratory evaluation reveals peripheral eosinophilia. Chest radiography shows bilateral hyperinflation with patchy interstitial infiltrates.Chlamydia trachomatis
  • A 7-year-old girl presents with a 2-week history of low-grade fever, malaise, headache, and a persistent nonproductive cough. She appears well, but lung auscultation reveals diffuse crackles. Chest radiography demonstrates prominent bilateral interstitial infiltrates.Mycoplasma pneumoniae
  • A 3-year-old boy presents with abrupt onset of high fever, chills, and a productive cough. He appears toxic. Lung auscultation reveals focal crackles and decreased breath sounds in the right lower lung field. Chest radiography shows a dense right lower lobar consolidation.Streptococcus pneumoniae
  • An unimmunized 2-year-old boy is brought to the emergency department with rapid onset of high fever, severe sore throat, drooling, and respiratory distress. He is sitting upright, leaning forward with his neck hyperextended, and has inspiratory stridor.Haemophilus influenzae type b

Answer

The correct matches are: 1) The afebrile infant with staccato cough and eosinophilia matches Chlamydia trachomatis. 2) The school-aged child with atypical 'walking pneumonia' matches Mycoplasma pneumoniae. 3) The young child with abrupt lobar consolidation matches Streptococcus pneumoniae. 4) The unimmunized child with tripod positioning and drooling matches Haemophilus influenzae type b.
Each clinical vignette provides classic pathognomonic features for a specific pediatric respiratory pathogen. Accurate pattern recognition of the symptom onset, patient age, immunization status, and radiographic findings is essential for initiating the appropriate targeted antimicrobial therapy or emergency intervention.

Step-by-Step Solution

1
Analyze the first clinical vignette.
Identifies typical features of C. trachomatis pneumonia.
The infant is in the classic age range (1-3 months) and presents with the signature staccato cough, lack of fever, and peripheral eosinophilia.
2
Analyze the second clinical vignette.
Identifies features of atypical pneumonia caused by M. pneumoniae.
The patient is school-aged and presents with an insidious onset, prominent cough, and bilateral infiltrates despite a non-toxic appearance.
3
Analyze the third clinical vignette.
Identifies features of typical bacterial pneumonia caused by S. pneumoniae.
The patient presents with acute, severe symptoms, high fever, and focal lobar consolidation, which are hallmarks of typical bacterial pneumonia.
4
Analyze the fourth clinical vignette.
Identifies acute epiglottitis caused by H. influenzae type b.
The child is unimmunized and presents with classic signs of epiglottitis, including drooling, dysphagia, respiratory distress, and tripod positioning.

Key Concept

Classic presentations of pediatric respiratory infections
Estimated Time:2m 0s
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Topics

Pediatric Infectious Diseases

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