How is chickenpox transmitted?

Written by Li Ya Ping

Dermatology Department

Updated on November 26, 2024

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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 Hu Qi Feng

Pediatrics

45sec

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Symptoms and Treatment of Chickenpox in Children

Chickenpox is an acute, contagious, exanthematous disease caused by varicella-zoster virus infection. Before the rash appears, symptoms such as fever, discomfort, and loss of appetite may occur. The fever typically lasts about one day before the rash emerges. The rash initially appears on the head, face, and trunk with a centripetal distribution. The rash can present as macules, papules, vesicles, and crusts all appearing simultaneously. Rashes can also appear on the mucous membranes of the mouth and the genital area. The treatment for chickenpox involves symptomatic and supportive care, and antiviral medications may be used appropriately to protect the skin and prevent scratching.

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Written by Yuan Lin Yan

Infectious Disease

1min 2sec

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Chickenpox prevention measures

Chickenpox is an acute infectious disease, and prevention of the infection mainly involves the following three aspects: First, control the source of infection. Patients with chickenpox are the only source of infection, so they should be isolated until all the chickenpox blisters have crusted over. Second, cut off the transmission route. Avoid close contact with chickenpox patients, prevent airborne droplet transmission, and avoid contact with items contaminated with the chickenpox virus. Third, protect susceptible populations. Chickenpox is highly contagious and generally susceptible in the population. Infants over one year old can be vaccinated with the chickenpox vaccine for prevention. Regular exercise, nutritional enhancement, physical strengthening, frequent hand washing, and maintaining ventilation in indoor environments are also advisable.

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Written by Li Jiao Yan

Neonatology

56sec

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Can you get the chickenpox vaccine if you have a cold?

Vaccination is generally required when the baby is healthy, as most vaccines are antigens introduced into the human body to elicit an antibody response from the immune system. If a baby has a cold, it indicates a weaker immune resistance and possible bacterial or viral infection. Vaccinating in such a condition could potentially worsen the cold due to the already compromised immune system and may lead to other side effects such as high fever, rashes, or even other infections. Therefore, it is not recommended to vaccinate while the baby has a cold. It is better to wait a few days until the cold symptoms have completely subsided before vaccinating. Generally, delaying vaccination will not affect the baby and will be rescheduled according to the plan. Thus, it is best not to vaccinate when the baby has a cold.

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Written by Yuan Lin Yan

Infectious Disease

1min 7sec

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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.

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Written by Yuan Lin Yan

Infectious Disease

1min 47sec

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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.