What is chickenpox?

Written by Yuan Lin Yan
Infectious Disease
Updated on September 03, 2024
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Chickenpox is a contagious disease caused by the varicella-zoster virus, commonly seen in children and prevalent in the spring season. The only source of infection is individuals with chickenpox. It spreads through respiratory droplets and direct contact. The disease is highly contagious and the general population is susceptible, but once recovered, long-lasting immunity is acquired. Clinically, symptoms may include mild fever, headache, fatigue, sore throat, cough, and loss of appetite, lasting for one to two days before the appearance of a rash. The rash first appears on the trunk and then spreads to the face and limbs. Chickenpox rash usually appears in batches, so at the same site, maculopapular rash, vesicles, and crusts can be seen. The crusts typically fall off about a week later, generally leaving no scars. Chickenpox is a self-limiting disease and typically resolves on its own in about ten days.

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Written by Yuan Lin Yan
Infectious Disease
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What are the symptoms and treatments for chickenpox in children?

Symptoms of chickenpox in children vary with age. Infants often show no symptoms or only mild symptoms, which can include mild fever, irritability, and refusal of breast milk, accompanied by a rash. Older children may experience mild fever, headache, fatigue, sore throat, coughing, and decreased appetite. These symptoms persist for one to two days before a rash appears. The rash initially appears on the trunk and then spreads to the face and limbs. Chickenpox rashes often emerge in batches, so the same area may show maculopapular lesions, vesicles, and crusts at the same time. The crusts typically fall off about a week later, usually leaving no scars. Secondary bacterial skin infection, pneumonia, encephalitis, and hepatitis are possible complications. In terms of treatment, infected children should be isolated until all the vesicles have crusted over. During the fever, they should rest in bed, consume an easily digestible diet, stay hydrated, and practice enhanced skincare to prevent infection of the vesicles. Antiviral treatment within 24 hours of rash onset can control the progression of the rash and speed up recovery. If a secondary bacterial infection develops, antibiotics should be used. In cases where encephalitis causes cerebral edema, dehydration treatments should be administered. The use of corticosteroids is not advisable for treating chickenpox.

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Written by Li Ya Ping
Dermatology Department
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How is chickenpox transmitted?

Chickenpox is caused by the varicella-zoster virus infection, and it can be transmitted in two ways. One way is through the secretion of the nasopharynx, such as contagious droplets spread by coughing, sneezing, or talking, which can infect people nearby. The fluid from the blisters of chickenpox is also contagious. The primary rash of chickenpox consists of blisters, and before these blisters dry up and crust over, touching the fluid from these blisters can also transmit chickenpox. Therefore, patients with chickenpox need to be isolated until the blisters dry and form crusts before quarantine can be lifted.

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Written by Han Jian Hua
Infectious Disease
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When to get the chickenpox vaccine?

Chickenpox primarily affects infants and children, and the target group for chickenpox vaccination is mainly 1-12 years old. During this age period, most children enter preschool or elementary school institutions, and the chickenpox virus is highly contagious, transmittable through droplets and contact. Once one child contracts chickenpox, the surrounding children are almost certain to be infected too. Additionally, since there are currently no effective medications to cure chickenpox, it is best to vaccinate within this age range, namely 1-12 years old. Adults can receive the chickenpox vaccine without age restrictions. The timing can be decided based on individual circumstances, but it is generally recommended to get vaccinated before the onset of the peak season for chickenpox, which is best before the spring and winter seasons.

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Written by Zhu Zhu
Dermatology
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The differences between measles and chickenpox

Measles and chickenpox, though both are diseases caused by viral infections, have clear differences. Measles is caused by the measles virus, while chickenpox is caused by the varicella-zoster virus. Furthermore, measles generally begins with a fever, and after a few days of fever, red spots and papules appear, whereas with chickenpox, clear vesicular papules appear initially on the trunk or limbs.

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Written by Yuan Lin Yan
Infectious Disease
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How is chickenpox treated?

Chickenpox generally has a good prognosis, and does not leave scars after the scabs fall off. Its treatment mainly includes three aspects: First, general and symptomatic treatment. Patients should be isolated until all the vesicles have scabbed over. Rest in bed during the fever period, consume easily digestible food, and ensure adequate hydration. Enhanced nursing care is important to keep the skin clean and avoid scratching, which could lead to secondary infections. Second, antiviral treatment. Early use of antiviral medications can be effective. Antiviral treatment within 24 hours of the appearance of the rash can control its progression and speed up recovery. Third, prevention of complications. Antibacterial drugs should be used in cases of secondary bacterial infections. For patients with encephalitis presenting with cerebral hemorrhage, dehydration treatment should be administered. Corticosteroids should not be used in chickenpox.