Varicella
At a Glance
Varicella, commonly known as chickenpox, is a highly contagious viral infection that causes an itchy, blister-like rash across the entire body along with flu-like symptoms.
While it most frequently affects children under the age of 10, the condition can occur in unimmunized individuals of any age, though universal vaccination has significantly reduced its commonality.
This condition is an acute and typically self-limiting illness that is manageable with supportive care, although the virus remains dormant in the body and can reactivate later in life.
The outlook is generally excellent with most healthy individuals recovering fully within one to two weeks with no lasting complications, maintaining a normal life expectancy.
How It Affects You
Varicella affects the body by causing a systemic viral infection that primarily targets the skin and mucous membranes. The virus replicates within the body, triggering an immune response that leads to widespread inflammation and visible skin lesions. Key effects on the body include:
- The development of an itchy, vesicular rash that progresses from bumps to blisters and scabs across the entire body.
- Systemic flu-like symptoms such as fever, fatigue, and muscle aches that exhaust the body.
- The establishment of a latent infection in nerve tissues, where the virus remains dormant after the initial recovery.
Causes and Risk Factors
Causes
Varicella is caused by the varicella-zoster virus (VZV), which spreads easily from person to person through respiratory droplets when an infected person coughs or sneezes, or through direct contact with fluid from the blisters. The virus enters the body through the respiratory tract or eyes and begins to replicate, eventually spreading to the skin to cause the characteristic rash.
Risk Factors
The primary risk factor is a lack of immunity, meaning anyone who has never had the disease or received the vaccine is at high risk of infection if exposed. Working in environments with close contact, such as schools or childcare centers, increases the likelihood of exposure. Individuals with weakened immune systems, infants, and pregnant women are at a higher risk for developing severe forms of the disease.
Prevention
Vaccination is the most effective primary prevention strategy, offering high levels of protection against infection and severe disease. Two doses of the varicella vaccine are typically recommended for children and unimmunized adults. Avoiding close contact with infected individuals until their rash has fully crusted over helps reduce the spread of the virus to others.
Diagnosis, Signs, and Symptoms
Signs and Symptoms
The most clinically meaningful symptom is a rash that evolves through three stages: pink or red bumps (papules), small fluid-filled blisters (vesicles), and crusts and scabs. It is common for all three stages of the rash to be present simultaneously. Before the rash appears, individuals often experience fever, malaise, loss of appetite, and headache. The rash usually starts on the chest, back, and face before spreading to the rest of the body.
Diagnosis
Clinicians typically identify varicella based on the characteristic appearance of the rash and the patient's history of exposure. Laboratory tests, such as PCR analysis of skin lesions or blood tests, are generally reserved for atypical cases or to confirm the diagnosis in high-risk patients. The condition must be distinguished from other skin issues like insect bites, impetigo, scabies, or other viral exanthems.
Treatment and Management
Treatment and Management Strategies
Treatment for healthy children primarily focuses on managing symptoms to provide comfort while the immune system clears the virus. Over-the-counter acetaminophen may be used to reduce fever, but products containing aspirin must be avoided entirely due to the risk of Reye's syndrome, a rare but life-threatening condition. Calamine lotion, oatmeal baths, and antihistamines can help soothe severe itching. In severe cases or for high-risk individuals, doctors may prescribe antiviral medications like acyclovir to shorten the duration of the illness.
When to See a Doctor
Most cases can be managed at home, but medical advice should be sought if the fever lasts longer than four days or rises above 102 degrees Fahrenheit. Immediate care is needed if the rash becomes very red, warm, or tender, suggesting a secondary bacterial infection. Emergency medical attention is required if there is difficulty breathing, severe vomiting, confusion, or difficulty waking up.
Severity and Prognosis
Severity
Varicella is generally mild in healthy children but can be moderate to severe in adults, infants, and immunocompromised individuals. The severity of the rash varies, with some individuals having only a few spots and others having hundreds of lesions covering the body. Breakthrough infections in vaccinated people are usually much milder, often without fever and with fewer than 50 skin lesions.
Duration and Course
The disease follows an acute course, typically lasting 5 to 10 days from the onset of the rash until all lesions have crusted. The incubation period before symptoms appear is usually 14 to 16 days after exposure. Once the initial infection resolves, the virus enters a latent phase in the nerve ganglia, where it can remain indefinitely.
Complications and Prognosis
While the prognosis is excellent for most, complications can occur, including bacterial skin infections, pneumonia, and encephalitis (inflammation of the brain). Long-term effects generally involve the risk of the virus reactivating years later as herpes zoster (shingles). Mortality is very rare in healthy children but increases in adults and those with underlying health conditions.
Impact on Daily Life
Impact on Daily Life
The condition requires strict isolation, meaning children must stay home from school and adults from work until all blisters have crusted over to prevent spreading the virus. The intense itching can disrupt sleep and daily focus, making the recovery period uncomfortable. Families often need to arrange for childcare or take time off work, which can cause logistical and financial stress.
Coping Strategies
To manage discomfort, wearing loose, soft clothing and keeping the environment cool can help reduce skin irritation. Keeping fingernails trimmed short is practical for preventing skin damage and secondary infections from scratching. Distraction techniques like reading or gentle play can help take a child's mind off the itching.
Questions to Ask Your Healthcare Provider
- How long is the contagious period for this condition?
- What specific signs indicate a secondary bacterial infection?
- Are there over-the-counter medications I should strictly avoid?
- Is the vaccine recommended for other members of the household?
- What symptoms warrant a trip to the emergency room?
Common Questions and Answers
Q: Can a person get varicella more than once?
A: It is very rare to get varicella more than once as the initial infection usually provides lifelong immunity, though the virus can reactivate later as shingles.
Q: Why is the vaccine necessary if the disease is usually mild?
A: The vaccine prevents severe complications, hospitalizations, and deaths that can occur even in healthy children and adults, and it reduces the overall spread of the virus in the community.
Q: Can I catch shingles from a person with varicella?
A: No, you cannot catch shingles from someone with varicella, but a person with shingles can spread the virus to an unimmune person, causing them to develop chickenpox.
Q: Is it safe to take ibuprofen for the fever associated with varicella?
A: Some healthcare providers advise against using ibuprofen due to a small risk of severe skin infections, so acetaminophen is generally the preferred choice for fever reduction.
Q: How long does it take for the spots to go away completely?
A: The blisters typically crust over within a week, and the scabs fall off over the next week or two, usually without leaving permanent scars unless they were infected.