What temperature constitutes a high fever in baby roseola?

Written by Yan Xin Liang

Pediatrics

Updated on March 21, 2025

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Roseola infantum is an acute febrile exanthematous disease caused by human herpesvirus type 6 or 7. Its characteristic is that after 3-5 days of fever, the body temperature suddenly drops, and rose-pink maculopapular rashes appear on the skin. The condition then improves, and if there are no complications, recovery can be swift.

Thus, in the early stages of roseola infantum, high fever predominates, generally reaching temperatures around 39 degrees Celsius, or even exceeding 40 degrees Celsius. During the initial high fever, febrile convulsions can occur. Some patients may experience nausea, vomiting, coughing, and drowsiness, while others may exhibit symptoms like diarrhea and swollen, congested tonsils.

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What should not be eaten with baby sudden rash?

Roseola infantum is caused by human herpesvirus types 6 and 7, a common acute rash infectious disease in pediatrics, also known as baby roseola. Its main characteristic is high fever for 3-4 days, followed by a rash as the fever subsides. Since roseola infantum is clearly a viral infection, its treatment mainly involves symptomatic management. For children in pediatric emergency care, while actively managing symptoms, it is essential to ensure adequate hydration and nutrition, so normal diet is still necessary. However, the diet should be light and easy to digest. Foods that are difficult to digest, such as large fish, large pieces of meat, or raw and cold irritants like some beverages or colder foods, should be avoided.

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What should I do about baby rash?

Roseola infantum, also known as baby rose rash, is an acute contagious disease in children caused by viral infection. The characteristics of the disease include a sudden onset, with an initial fever lasting 3 to 5 days, followed by a rash after the fever subsides, usually resolving on its own. Roseola infantum is a self-limiting disease with a duration of about one week. Treatment does not shorten the recovery time but can help alleviate uncomfortable symptoms. Treatment measures include: 1. Rest and hydration – Encourage the child to rest and drink plenty of fluids. If the child is very uncomfortable or refuses to drink, hospital treatment may be necessary. 2. Fever management – If the child is very uncomfortable due to high fever, fever-reducing medication can be taken under a doctor's guidance, according to the child's weight.

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Written by Tong Peng

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What to do with baby's sudden rash?

If a child develops sudden exanthema, parents need not be overly worried, as this condition is a rash-causing disease due to herpes virus infection and it can heal on its own. Often, the child may experience high fever for three to five days, during which physical cooling techniques and oral antipyretics can be used for symptomatic treatment. It is also appropriate to ensure the child drinks plenty of water and eats nutritious food. Once the fever symptoms alleviate, scattered rose-like rashes may appear on the child's face and trunk, which can fade on their own. During this period, symptoms of indigestion or itchy skin may occur, and taking calamine for itch relief and oral probiotics can help alleviate symptoms of digestive upset. (The use of medications should be conducted under the guidance of a physician.)

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Written by Yan Xin Liang

Pediatrics

46sec

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How many days does the rash usually subside in young children with sudden onset?

How many days does it take for infantile roseola to fade? Typically, infants with roseola may experience a fever for three to five days, followed by the appearance of the rash, which usually lasts about three days. After the rash fully emerges, it will gradually fade away. Therefore, the rash from infantile roseola might appear as red, rose-like rashes, spreading across various parts of the body. It usually starts to subside slowly after 2 to 3 days, leaving no marks or skin scars. Unlike measles, where the skin can feel rough, pitted, or flaky after the rash subsides, the skin surface after recovering from roseola is very smooth, leaving no traces.

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Written by Yan Xin Liang

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33sec

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What is roseola infantum?

Roseola infantum is a disease characterized by a fever, followed by a rash after the fever subsides. This disease is caused by an infection with human herpesvirus type 6 or type 7. Typically, it starts with a fever lasting three to five days, which can be moderately high. Generally, a rash appears after the fever subsides, primarily on the torso but it can also spread to the limbs. The rash usually fades within about two days and leaves no scars once it has disappeared.