Overview

Chickenpox is a highly contagious viral infection caused by the varicella-zoster virus (VZV). It primarily affects children but can occur at any age. Before widespread vaccination, it was considered a common childhood illness. Today, due to the availability of the varicella vaccine, cases have significantly reduced in many countries.

Causes and Transmission

Chickenpox spreads through respiratory droplets when an infected person coughs or sneezes, and through direct contact with the fluid from the blisters. A person is contagious from 1–2 days before the rash appears until all blisters have formed scabs.

Symptoms

The illness usually begins with mild fever, fatigue, headache, and loss of appetite. Within a day or two, an itchy red rash appears, which quickly develops into fluid-filled blisters. These blisters eventually burst and form scabs. The rash often starts on the face, chest, and back before spreading to the rest of the body. New crops of blisters may continue to appear for several days.

In children, chickenpox is generally mild. However, in adults, pregnant women, newborns, and individuals with weakened immune systems, it can be more severe.

Complications

While most cases resolve without issues, complications can include bacterial skin infections, pneumonia, brain inflammation (encephalitis), and dehydration. Adults are more likely than children to experience severe complications.

Treatment

There is no specific cure for chickenpox, but treatment focuses on relieving symptoms and preventing complications. Measures include:

• Rest and adequate hydration
• Paracetamol for fever (avoid aspirin due to risk of Reye’s syndrome)
• Calamine lotion or antihistamines for itching
• Keeping nails trimmed to prevent skin infections

In high-risk individuals, antiviral medications such as acyclovir may be prescribed.

Prevention

Vaccination is the most effective way to prevent chickenpox. The varicella vaccine is safe and highly effective, usually given in two doses. Vaccinated individuals who still get infected typically experience milder symptoms.

When to See a Doctor

Seek medical attention if:

• Fever persists beyond four days
• The rash becomes very red, warm, or painful
• There is difficulty breathing
• The patient is pregnant or immunocompromised

Chickenpox is usually self-limiting, but timely care and vaccination are key to preventing complications and ensuring a smooth recovery.