A child has a low fever that fades, and a few days later both cheeks turn bright red as if slapped. That pattern can point to fifth disease (erythema infectiosum), caused by parvovirus B19. By the time the rash shows, the child is generally no longer very contagious, which changes how parents think about school.
Why It Happens
Fifth disease is an infection with parvovirus B19. HealthyChildren explains that the typical “slapped cheek” rash tends to appear a few days after fever or cold-like symptoms. The virus is thought to spread mainly through respiratory secretions such as coughs and sneezes.
According to the CDC, symptoms are usually mild and may include fever, headache, cough, sore throat, runny nose, and joint or muscle aches. Roughly 1 in 4 infected people have no symptoms at all, which is why it is often unclear who passed it along.
How It Differs by Age
It is most common in preschool and school-age children and often follows a sequence. A few days of low fever and cold symptoms come first, then both cheeks turn clearly red. A lacy, net-like red rash can then spread over the arms, legs, and trunk. In children the rash usually fades within 7-10 days, but it can come and go for several weeks, often looking stronger after sun exposure, a warm bath, or exercise. Teens and adults more often have joint pain than a prominent rash.
Care at Home
There is no specific medicine, so care is mostly supportive. Offer fluids and rest if there is a fever. Check the dose with a doctor or pharmacist before giving a fever reducer, based on your child’s age and weight. If the rash itches, keep the room cool and trim fingernails.
For daycare, HealthyChildren notes that once the rash is visible the child is no longer considered contagious, so a child without fever who feels well can often attend. Programs can differ, so check the policy. The period of greatest spread is thought to be the cold-like phase before the rash, so handwashing and covering coughs help most at that time.
Common Misunderstandings
First, that red cheeks must mean fever. The cheeks can be vivid without any fever. Second, that a child should stay isolated while the rash lasts. The rash appears after the main contagious phase. Third, that a long-lasting rash means the illness is getting worse. Coming and going over weeks is a known course. Fourth, that risk is the same for everyone. Early pregnancy, weakened immune systems, and blood disorders such as sickle cell disease call for more caution.
The CDC notes that infection early in pregnancy can slightly raise the risk of miscarriage and may be linked to blood, heart, or liver problems in the unborn baby. Most pregnancies are unaffected, but if a pregnant family member has been around a child with fifth disease, it is worth talking with an obstetric provider.
Signs That Need Emergency Care Right Away
Go to the emergency room right away if your child has trouble breathing, looks pale or bluish and limp, has a very fast heartbeat with dizziness, or has a persistent high fever with confusion. A child with a blood disorder or weakened immune system who develops fifth disease should be seen early even if symptoms seem mild. If it is not an emergency but a pregnant family member was exposed, joint pain lingers, or the rash lasts more than several weeks, contact a doctor. Consider talking with a pediatrician if you are unsure. This information reflects general guidance from the United States; if you live elsewhere, check with a local pediatrician. This information isn’t a diagnostic tool and doesn’t replace advice from a medical professional.