A 7-year-old boy from Chennai presents with fever for 5 days, severe myalgia, and headache. On examination, he is alert but appears ill. Temperature is 39.5°C, pulse 110/min, BP 100/65 mmHg, respiratory rate 24/min. A blanching maculopapular rash is noted over the trunk and extremities, sparing palms and soles. Laboratory investigations show: WBC 3,200/μL, platelet count 85,000/μL, AST 120 IU/L, ALT 95 IU/L, hematocrit 38%. Dengue NS1 antigen is positive. What is the current dengue severity classification for this child?

Explanation

## Dengue Severity Classification in Children **Key Point:** The 2009 WHO classification stratifies dengue into three tiers based on clinical and laboratory findings. This child meets criteria for dengue WITH warning signs. ### Clinical Assessment The child has: - Fever (5 days) with systemic symptoms (myalgia, headache) - Rash (blanching maculopapular) - Mild thrombocytopenia (85,000/μL) - Mild transaminitis (AST 120, ALT 95) - **Stable vital signs** (BP 100/65 mmHg, HR 110 age-appropriate) - **No evidence of plasma leakage** (hematocrit 38% is normal; no ascites/pleural effusion mentioned) ### Warning Signs Present **High-Yield:** The 2009 WHO defines warning signs as: - Abdominal pain or tenderness - Persistent vomiting - **Bleeding** (petechiae, purpura, or mucosal bleeding) - Lethargy or restlessness - **Liver enlargement** (hepatomegaly >2 cm) - **Rapid fall in platelet count** with hematocrit rise This child has **thrombocytopenia (85,000/μL)**, which is a significant finding and constitutes a warning sign in the context of dengue, indicating potential progression toward plasma leakage. ### Differential Classification | Severity Grade | Clinical Features | Lab Findings | | --- | --- | --- | | **Dengue without warning signs** | Fever + systemic symptoms, stable vitals, no bleeding | Mild/no thrombocytopenia, normal hematocrit | | **Dengue WITH warning signs** | Above + ≥1 warning sign (abdominal pain, vomiting, bleeding, lethargy, hepatomegaly, rapid platelet fall) | Thrombocytopenia ≤100,000/μL OR rising hematocrit | | **Severe dengue (DHF)** | Warning signs + evidence of plasma leakage | Hematocrit rise ≥20%, pleural effusion, ascites, hypoproteinemia | | **Dengue shock syndrome** | Severe dengue + circulatory failure | Narrow pulse pressure (<20 mmHg), hypotension | **Clinical Pearl:** The presence of thrombocytopenia (85,000/μL) in the context of dengue fever is a red flag for progression and mandates close monitoring for plasma leakage. This child is in the critical phase (days 3–7 of illness) when complications are most likely. **Mnemonic: "ABCDE of Dengue Warning Signs"** — **A**bdominal pain, **B**leeding, **C**irculatory instability (lethargy/restlessness), **D**eclining platelets, **E**nlarged liver. ### Management Implications This child requires: 1. Daily monitoring of platelet count and hematocrit 2. Ultrasound abdomen to assess for plasma leakage 3. Careful fluid management (avoid over-hydration) 4. Hospitalization for close observation 5. Platelet transfusion only if active bleeding or platelet count <10,000/μL with bleeding risk