Dengue Fever Explained | Symptoms, Mosquito Cause & 3 Stages (Febrile, Critical, Recovery)

Описание: Dengue fever is a common mosquito-borne viral disease, especially in tropical and subtropical regions. It is often called “breakbone fever” because of the severe muscle and joint pain it causes.
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In this lecture, we explain what dengue fever is, which mosquito causes it, its symptoms, and the three clinical stages of dengue fever — including why the critical phase is the most dangerous and needs close monitoring.

This video is ideal for MBBS students, nursing students, paramedical staff, parents, and the general public.

📚 In This Video, You Will Learn:
🔹 What Is Dengue Fever?

• Viral infection spread by mosquitoes
• Common in tropical & subtropical climates
• Also known as breakbone fever due to severe pain

🔹 Symptoms of Dengue Fever

• High fever (up to 104°F / 40°C)
• Severe headache (especially behind the eyes)
• Muscle, joint & bone pain
• Skin rash appearing after fever
• Nausea & vomiting
• Extreme fatigue & weakness
• Swollen lymph glands

⚠️ Severe dengue symptoms:
• Bleeding
• Severe abdominal pain
• Vomiting blood
• Extreme weakness
• Can be life-threatening without urgent care

🦟 Which Mosquito Causes Dengue Fever?

• Aedes aegypti (main cause)
• Also Aedes albopictus

Key identification features:
• Black body with white stripes
• Lyre-shaped marking on thorax (Aedes aegypti)
• Day-time biting mosquito
• Bites around ankles & legs

🔬 3 Clinical Stages of Dengue Fever
1️⃣ Febrile Phase (2–7 days)

• Sudden high fever
• Headache, retro-orbital pain
• Muscle & joint pain
• Nausea, vomiting, rash
• Virus present in blood (viremia)

👉 Management:
• Paracetamol only
• Avoid aspirin & ibuprofen
• Adequate hydration

2️⃣ Critical Phase (24–48 hours) ⚠️

• Occurs when fever subsides
• Most dangerous stage

What happens:
• Plasma leakage from blood vessels
• Low platelets (thrombocytopenia)
• High hematocrit
• Fluid in chest (pleural effusion) & abdomen (ascites)
• Risk of shock & organ failure

👉 Requires urgent medical care

3️⃣ Recovery Phase (48–72 hours)

• Patient improves
• Appetite returns
• Increased urine output
• Fluids reabsorbed into bloodstream
• Characteristic itchy rash:
“Isles of white in a sea of red”

⚠️ Risk of fluid overload if IV fluids were excessive earlier.

🎯 Who Should Watch This Video?

MBBS, Nursing & Paramedical students

USMLE, PLAB, FCPS, NEET-PG aspirants

Parents & caregivers

Anyone wanting a clear explanation of dengue fever

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