Pediatrics essay on the following......Dengue, DPT.....Pediatric TB

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The essay above is a comprehensive, exam-ready pediatrics essay covering all three requested topics. Here is a quick map of what was covered:

PART I — Dengue

Etiology (4 Flavivirus serotypes), epidemiology (infants at highest risk for severe disease), pathophysiology of antibody-dependent enhancement
WHO 2009 severity classification (dengue without/with warning signs / severe dengue)
Three clinical phases (febrile → critical → convalescent) with timing
Diagnosis: NS1 antigen + IgM EIA + RT-PCR; tourniquet test
Management: supportive, no NSAIDs/aspirin, fluid therapy in critical phase
Dengvaxia vaccine — only for seropositive children ≥9 years

PART II — DPT

Diphtheria: pseudomembrane formation, bull neck, ADP-ribosylase toxin mechanism, myocarditis + neuropathy complications, antitoxin + erythromycin treatment, DTaP schedule
Pertussis: three stages (catarrhal → paroxysmal → convalescent), infants <6 months have atypical apneic presentation, marked lymphocytosis, azithromycin treatment, maternal Tdap strategy
Tetanus: neonatal tetanus (contaminated cord) vs. generalized tetanus in children, HTIG + metronidazole + diazepam management, DTaP schedule table

PART III — Pediatric TB

Primary vs. secondary TB, Ghon complex formation
Unique pediatric features: often asymptomatic, hilar lymphadenopathy (not cavitary disease), high dissemination risk in <5 years
Extrapulmonary sites: scrofula, TB meningitis, miliary TB, Pott's disease
Diagnostic challenges: TST (preferred <2 yrs), IGRA (preferred in BCG-vaccinated ≥2 yrs), gastric aspirate AFB, NOT IGRA/NAAT in <5 yrs
Regimens: 2HRZE/4HR for pulmonary; 2HRZE/10HR for meningitis/miliary; dexamethasone adjunct for meningitis

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