Introduction to Pediatric Infectious Diseases

Introduction to Pediatric Infectious Diseases
Key concepts, common pathogens, clinical approach, and prevention strategies

1. Overview

• Definition – Infectious diseases that affect infants, children, and adolescents.
• Why children are unique
  • Immature immune system → higher susceptibility.
  • Different exposure patterns (day‑care, schools).
  • Age‑specific anatomy (e.g., shorter airways, smaller sinuses).
• Goals of pediatric infectious disease care
  1. Prompt identification of the causative agent.
  2. Effective, age‑appropriate treatment.
  3. Prevention of complications and transmission.

2. Common Pediatric Pathogens by System

3. Clinical Approach

3.1 History Taking

1. Age & developmental stage – influences differential diagnosis.
2. Onset & course – sudden vs. gradual, fever pattern.
3. Exposure history – daycare, travel, sick contacts, pets, insects.
4. Vaccination status – gaps may point to preventable infections.
5. Past medical history – prematurity, chronic lung disease, immunodeficiency.

3.2 Physical Examination

• General appearance – ill‑looking, lethargic, irritability.
• Vital signs – fever, tachypnea, tachycardia.
• System‑specific clues
  • Respiratory: wheeze, crackles, retractions.
  • ENT: erythematous tonsils, otitis media signs.
  • Abdomen: tenderness, hepatosplenomegaly.
  • Skin: rash