Pediatric Pneumonia: Classification & Age-Specific Management Protocol

Overview

• Tintinalli's Emergency Medicine, Chapter 128
• Rosen's Emergency Medicine, Chapter 164

Part 1: Classification of Pneumonia in Children

A. By Etiology / Clinical Syndrome

B. By Age Group - Predominant Pathogens

• Viruses cause >70% of hospitalized pediatric pneumonia; they dominate in younger children
• S. pneumoniae remains the leading bacterial cause beyond the newborn period in all ages
• C. trachomatis is unique to infants 3-19 weeks (afebrile, staccato cough, conjunctivitis)
• B. pertussis classically in infants <1 year; also older children/adolescents
• Mycoplasma most common in school-age children (>5 years) - "walking pneumonia"

Part 2: Severity Assessment

WHO Tachypnea Thresholds (key diagnostic criterion)

Severity Classification

Part 3: Disposition Criteria

Tintinalli's Table 128-5 - Disposition by Age

• Neonates and infants <90 days - always admit
• Suspected B. pertussis (apnea risk - respiratory isolation)
• Active pulmonary TB (respiratory isolation)
• Significant comorbidities: cystic fibrosis, sickle cell, immunodeficiency, malignancy
• Social/caregiver inability to ensure outpatient treatment

Part 4: Age-Specific Antibiotic Treatment Protocol

Neonates (<4 weeks)

• Do NOT manage outpatient
• Inpatient: Ampicillin 150-200 mg/kg/day q6h + Ceftazidime 100 mg/kg/day q12h, OR Gentamicin 2.5 mg/kg/day
• Obtain blood, urine, and CSF cultures before starting antibiotics
• Pathogens: GBS, E. coli, gram-negative bacilli, Listeria

Infants 1 month - 3 months

• Strongly consider inpatient management
• Inpatient (1-2 months): Ampicillin + ceftriaxone (50 mg/kg/day)
  • Note: Avoid ceftriaxone in infants <1 month (risk of bilirubin displacement)
  • If C. trachomatis or B. pertussis suspected: add Azithromycin (preferred over erythromycin due to pyloric stenosis risk)
• Outpatient (if afebrile/Chlamydia suspected): Azithromycin 10 mg/kg day 1, then 5 mg/kg/day days 2-5, OR Erythromycin 20 mg/kg/day q6h

Infants/Children 3 months - 5 years

Most pneumonias in preschool-age children are viral - antibiotics are not required for well-appearing outpatients with likely viral etiology.

• First line: Amoxicillin 75-90 mg/kg/day divided q12h (or 90 mg/kg/day per IDSA)
  • Alternative: Amoxicillin-clavulanate (critically ill or resistant concern)
  • Cefuroxime 20-30 mg/kg/day q12h (penicillin alternative)
• If atypical suspected (Mycoplasma, C. trachomatis): Azithromycin 10 mg/kg day 1, then 5 mg/kg/day days 2-5; alternatives: clarithromycin, erythromycin, or doxycycline (if >7 years)

• Ampicillin or Penicillin G (if fully immunized, low local resistance)
• If not fully immunized or significant local pneumococcal resistance: Ceftriaxone
• Alternative: cefotaxime, levofloxacin (if growth maturity reached)
• If atypical co-infection suspected: add azithromycin
• If MRSA suspected: add Vancomycin or Clindamycin

School-Age Children 5-18 years

• Atypical coverage is the priority (Mycoplasma, C. pneumoniae dominant)
• Azithromycin 10 mg/kg day 1, then 5 mg/kg/day days 2-5 (first line)
• For bacterial (S. pneumoniae) concern: Amoxicillin 90 mg/kg/day
• Doxycycline (>7 years) is an alternative for atypicals
• Levofloxacin if growth maturity reached

• Ceftriaxone + azithromycin (covers both typical and atypical)
• If MRSA suspected: add vancomycin or clindamycin

Part 5: Empiric Treatment Summary Table

Part 6: Supportive Therapy & Monitoring

• Oxygen to maintain SpO2 >90-92% (>95% in severe cases)
• Pulse oximetry - continuous monitoring in admitted patients
• Hydration - IV fluids if poor oral intake
• Antipyretics for fever/comfort
• Blood cultures: not routine for well-appearing outpatients; obtain in ill-appearing hospitalized children
• CBC: not routinely recommended (does not reliably distinguish viral vs bacterial)
• Chest radiograph: confirms diagnosis, identifies complications (effusion, empyema, pneumatocele)
• Pleural effusion: thoracentesis if enlarging or causing respiratory compromise

Part 7: Complications and Follow-Up

Recent Evidence Update

• Italian intersociety consensus (2024) supports amoxicillin as first-line for mild-moderate CAP in previously healthy children (PMID: 39427174)
• Complicated CAP meta-analysis (2025) highlights increasing complexity of parapneumonic empyema management (PMID: 41222098)

• Tintinalli's Emergency Medicine, 9th ed., Chapter 128 (Pneumonia in Infants and Children)
• Rosen's Emergency Medicine, Chapter 164
• Harriet Lane Handbook, 23rd ed. (IDSA/PIDS CAP guidelines, age-specific dosing)

Pediatric Pneumonia: Exam-Style Long Answer Scenarios

How Examiners Set These Questions

1. Extract the diagnostic clues (age + symptoms + signs)
2. Name the most likely pathogen for that age
3. Classify severity and decide admission vs outpatient
4. Give the correct empiric antibiotic with dosing
5. Anticipate and manage complications
6. Know when to escalate

SCENARIO 1 - The Neonate

A 12-day-old boy is brought to the ED with poor feeding for 24 hours, temperature 38.6°C, RR 68/min, and mild intercostal recession. He was born at term via normal vaginal delivery. Mother had GBS prophylaxis but only 1 hour before delivery. CXR shows diffuse bilateral haziness.

How to Tackle It

• Group B Streptococcus (GBS) is the top suspect - maternal GBS prophylaxis given <4 hours before delivery is considered inadequate
• Gram-negative enteric bacilli (E. coli) and Listeria monocytogenes also on the list
• The diffuse bilateral haziness can mimic RDS, GBS pneumonia, or early sepsis

• Blood culture
• Urine culture
• Lumbar puncture for CSF (meningitis co-exists in ~10% of GBS sepsis)
• FBC, CRP, blood gas
• CXR

• Ampicillin 150-200 mg/kg/day IV divided q6-8h (covers GBS + Listeria)
• PLUS Ceftazidime 100 mg/kg/day IV q12h (covers gram-negatives)
• OR Gentamicin 2.5 mg/kg/dose (preferred in premature infants; synergistic with ampicillin against GBS)
• Do NOT use ceftriaxone in neonates - it displaces bilirubin from albumin, risk of kernicterus

• Oxygen to maintain SpO2 >92%
• IV fluids (NPO initially)
• Continuous cardiorespiratory and pulse oximetry monitoring
• Low threshold for NICU referral

• Forgetting LP = missed meningitis
• Using ceftriaxone in a neonate = dangerous error
• Not mentioning that prophylaxis <4h is inadequate = missed GBS risk context
• Saying "outpatient amoxicillin" = fail

• Rosen's Emergency Medicine, Chapter 164, p. 3195
• Tintinalli's Emergency Medicine, Chapter 128, Table 128-4

SCENARIO 2 - The Afebrile Infant

A 9-week-old girl is brought to clinic with a 3-week history of dry, staccato cough. She has been afebrile throughout. Her mother reports bilateral eye discharge since birth that was treated with topical eye drops. RR is 52/min. Chest exam shows diffuse bilateral rales. O2 sat is 95%. FBC shows eosinophilia. CXR: bilateral diffuse interstitial infiltrates with hyperinflation.

How to Tackle It

• Age 4-16 weeks + afebrile + staccato cough + conjunctivitis history = Chlamydia trachomatis pneumonia until proven otherwise
• This is a "classic examination setup" - examiners love this one
• Eosinophilia and bilateral interstitial infiltrates with hyperinflation complete the picture

• Azithromycin 10 mg/kg/day PO/IV for 5 days (first line)
• Alternative: Erythromycin ethylsuccinate 50 mg/kg/day q6h for 14 days
  • Note: Erythromycin in infants <6 weeks carries risk of infantile hypertrophic pyloric stenosis (IHPS) - azithromycin is preferred when available
• Amoxicillin, ampicillin, and cephalosporins will NOT work - they target cell wall synthesis; Chlamydia has no cell wall

• Supplemental oxygen
• Nasogastric feeds if oral intake compromised
• Pulse oximetry monitoring

• Parental testing - mother and partner should be tested and treated for Chlamydial STI
• Notify public health if required locally
• Do NOT prescribe a beta-lactam - that is the classic trap

• Rosen's Emergency Medicine, Chapter 164, Table 164.2 & 164.3

SCENARIO 3 - The Toddler (Classic Bacterial)

A 2.5-year-old boy presents with 2 days of fever (39.8°C), cough, and fast breathing. He is immunized up to date. O2 sat is 94%. RR is 44/min. He has right-sided dullness to percussion and reduced breath sounds at the right base. CXR: right lower lobe consolidation with a moderate right-sided pleural effusion. He is feeding poorly and has had no urine output for 6 hours.

How to Tackle It

• SpO2 94% (<90-92% threshold approaching)
• RR 44 (above 40 threshold for 1-5 year olds = tachypnea)
• Poor feeding + no urine output = dehydration
• Pleural effusion = complicated pneumonia

• Blood cultures (before antibiotics - bacteremia occurs in pneumococcal pneumonia)
• FBC, CRP, U&E, LFTs
• CXR (already done)
• Consider chest ultrasound to characterize the effusion
• If effusion enlarging or compromising breathing: thoracentesis
  • Send pleural fluid: Gram stain + culture, cell count and differential, protein, pH, glucose

• Ceftriaxone 50 mg/kg/day IV (if not fully immunized or local penicillin resistance concern)
• OR Ampicillin/Penicillin G (if fully immunized + low local resistance)
• Add Vancomycin or Clindamycin if MRSA is suspected (high fever, toxicity, failure to respond, or community MRSA prevalence)
• If effusion develops into empyema: surgical/interventional drainage (chest drain ± fibrinolytics or VATS)

• IV fluids for rehydration
• Oxygen to maintain SpO2 >92%
• Analgesia (chest pain from pleuritis)

• Resistant organism → escalate antibiotics, add vancomycin
• Empyema formation → imaging + drainage
• Wrong diagnosis → viral etiology, foreign body, cardiac

• Tintinalli's Emergency Medicine, Chapter 128, Tables 128-4 & 128-5

SCENARIO 4 - The School-Age Child ("Walking Pneumonia")

A 10-year-old girl presents with 2 weeks of gradually worsening dry, hacking cough, low-grade fever (37.8°C), headache, and mild sore throat. She is still attending school. O2 sat is 98%. RR is 20/min. Chest exam reveals unilateral left-sided rales. CXR: patchy left lower lobe infiltrate. FBC: WBC 8,000 (normal). Cold agglutinins positive.

How to Tackle It

• Age >5 years
• Gradual onset (not abrupt)
• Low-grade fever (not high)
• Dry hacking cough (not productive)
• Still going to school ("walking pneumonia")
• Normal WBC, cold agglutinins positive = Mycoplasma pneumoniae pneumonia, textbook presentation

• SpO2 98%, RR normal, well-hydrated, feeding
• "Walking pneumonia" = mild to moderate disease

• Azithromycin (Z-pack): 10 mg/kg on day 1 (max 500 mg), then 5 mg/kg/day on days 2-5 (max 250 mg/day)
• Alternative: Clarithromycin or Erythromycin
• Doxycycline (acceptable >7-8 years): 2-4 mg/kg/day divided q12h for 7-10 days - good choice in older children/adolescents
• Amoxicillin = wrong answer, will not work

• Hemolytic anemia (cold agglutinin-mediated)
• Stevens-Johnson syndrome (rare but important)
• Meningoencephalitis, transverse myelitis
• Myocarditis, pericarditis
• Arthritis
• "Red fingers" / erythema multiforme

• Rosen's Emergency Medicine, Chapter 164, Q&A section
• Tintinalli's Emergency Medicine, Table 128-4

SCENARIO 5 - The Failing Child (MRSA/Complicated)

An 18-month-old boy was diagnosed with pneumonia 4 days ago and started on amoxicillin as an outpatient. He now returns to the ED. His temperature is 40.1°C, RR 58/min, SpO2 88% on air. He is lethargic, pale, and not feeding. CXR: left-sided consolidation with a large lucency (pneumatocele) and shift of mediastinum to the right.

How to Tackle It

• SpO2 88% - critical
• Mediastinal shift - tension physiology developing
• Pneumatocele + high fever + toxicity = Staphylococcus aureus pneumonia (community-acquired MRSA increasingly common)
• This child is failing amoxicillin - organism is either resistant or this was never a penicillin-susceptible S. pneumoniae

• Airway: assess, position, prepare for possible intubation
• Breathing: high-flow oxygen immediately, target SpO2 >94%
• Circulation: IV access, fluid resuscitation, blood cultures
• Disability: assess GCS
• Exposure: full exam

• Blood cultures (before escalating antibiotics)
• FBC, CRP, procalcitonin, U&E, blood gas
• CXR (done)
• Urgent CT chest if pneumatocele/empyema suspected
• Consider MRSA nasal/wound swab

• Vancomycin 15 mg/kg IV q6h (MRSA coverage) - the backbone of treatment for suspected MRSA pneumonia
• OR Clindamycin (if clindamycin-susceptible MRSA locally; check D-zone test)
• Maintain beta-lactam coverage for S. pneumoniae: ceftriaxone or cefotaxime alongside
• Consider adding Linezolid in refractory cases (inhibits toxin production)

• Most resolve spontaneously over weeks to months
• Do NOT attempt to drain a simple pneumatocele - high risk of tension pneumothorax
• If tension pneumothorax develops (deviated trachea, absent breath sounds, haemodynamic instability): immediate needle decompression followed by chest drain

• SpO2 <90% despite supplemental oxygen
• Respiratory fatigue, possible impending failure
• Altered mental status (lethargy)
• Signs of impending shock (pallor, poor perfusion)

• Tintinalli's Emergency Medicine, pp. 2971-2973
• Rosen's Emergency Medicine, Chapter 164

How to Structure Every Long Answer

1. DIAGNOSIS / MOST LIKELY DIAGNOSIS  (2-3 lines, state your top diagnosis + why)
2. RELEVANT HISTORY / CLUES           (bullet the key features that led you there)
3. PATHOGEN BY AGE                    (name it, state why for that age group)
4. INVESTIGATIONS                     (relevant ones only - do not list everything)
5. SEVERITY ASSESSMENT               (outpatient / inpatient / ICU + why)
6. TREATMENT
   a. Antibiotic: name, dose, route, duration
   b. Supportive: oxygen, fluids, analgesia
   c. Specific (if complication): drainage, escalation
7. COMPLICATIONS TO MONITOR          (effusion, empyema, pneumatocele, MRSA)
8. FOLLOW-UP / FAILURE               (72-hour rule, what failure looks like)

The Mark-Winning Lines Examiners Look For