February 25, 2025, 3:43 am | Read time: 4 minutes
Three-day fever is one of the mild illnesses that children usually encounter early on. FITBOOK explains how parents should respond in case of an infection and what they need to watch out for.
Usually mild but intense: Three to four days of very high fever, followed by a rapid drop and then a rash. Three-day fever (roseola infantum) primarily affects infants and children up to the age of three. There is no vaccine against it.
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Overview
What is three-day fever?
The highly contagious infection is caused by herpes viruses, which are widespread globally. It is characterized by a rapidly rising fever that lasts three to four days and then suddenly subsides. A few hours later, a harmless, pale red rash appears, which also disappears on its own. By the age of three, almost all children have come into contact with the virus that causes three-day fever–though not always with symptoms or only in a mild form. Since infection is only possible once in a lifetime and the viruses remain in the body for life, illnesses in older children or adults are extremely rare.1
How children contract three-day fever
The causative human herpesvirus (human herpesvirus type 6, HHV 6) is transmitted through droplet infection, such as coughing, sneezing, or talking. Particularly tricky: The incubation period can be up to 17 days.2 The time between infection and outbreak is often so long that it is difficult to trace where and when the child was exposed to the virus.
Other symptoms of three-day fever
In addition to the high fever, which can exceed 104 degrees Fahrenheit, other accompanying symptoms may occur. According to the Federal Ministry of Health:3
- Diarrhea and vomiting
- Runny nose
- Inflamed throat and sore throat
- Irritability
- Swollen lymph nodes
- Swollen eyelids
- In infants, additionally a tense and bulging fontanelle
Also of interest: When should you take fever-reducing medication?
Proper home treatment
There are no specific medications for three-day fever, and generally, it is sufficient to treat the child symptomatically at home. This includes suppositories or lukewarm calf wraps to reduce fever if necessary. Due to possible swallowing difficulties from a sore throat, the child may have trouble drinking. Feverish children have a significantly increased need for fluids and can dehydrate quickly, which can be dangerous. Diluted fruit juices or tea sweetened with glucose can encourage more drinking. Breastfed infants should be nursed as often as possible. Dry diapers, dark urine, lethargy, or sunken eyes are strong warning signs. In these cases, parents should not hesitate to go to the emergency room.4
In the second phase of the rash, which primarily spreads over the torso and neck, the worst is over. Since the rash does not itch or cause other discomfort, it is sufficient to wait until it subsides, which can take a few hours to two days.
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What to do during a febrile seizure?
Febrile seizures are rare and usually harmless, but they can be frightening. Since the fever rises very quickly with three-day fever, a slightly increased susceptibility to febrile seizures has been noted.5 These manifest as muscle twitching, unconsciousness, rolled eyes, and dilated pupils. The face and lips may turn blue. In this case, parents should remain calm, loosen the child’s clothing, open a window for fresh air, and not hold the child too tightly. If the febrile seizure occurs for the first time or lasts longer than three minutes, it is essential to call emergency services (911) to rule out other causes.6 Therefore, it is also important to measure the time from start to finish.
How can I protect my child?
Unfortunately, it is hardly possible to protect your child from the virus that causes three-day fever. There is no vaccine against the herpes virus. What remains are the usual hygiene measures, such as regular handwashing, which should be practiced with the child as early as possible, and ensuring they do not play with other children showing symptoms of illness. Fortunately, three-day fever is considered easily treatable, leaves no lasting damage, and is completely overcome within a week.