Fifth disease is a viral infection that clears up on its own, and treatment focuses entirely on managing symptoms while your body fights it off. There is no antiviral medication or vaccine for the virus that causes it (parvovirus B19), so the goal is staying comfortable until the infection runs its course, typically within one to three weeks.
What Fifth Disease Looks and Feels Like
Fifth disease typically unfolds in two phases. The first phase feels like a mild cold: low fever, headache, sore throat, runny nose, and muscle aches. This is the stage when you’re actually contagious and can spread the virus to others through respiratory droplets.
A few days after the cold-like symptoms fade, the second phase begins. In children, this is the signature “slapped cheek” rash: bright red patches on both cheeks that look like someone slapped them. A lacy, pinkish rash may also spread to the arms, legs, and trunk. By the time this rash appears, you’re generally no longer contagious, and it’s usually safe to return to work or school. In fact, most school and daycare exclusion policies do not require children with fifth disease to stay home once the rash is the only remaining symptom.
Adults often skip the facial rash entirely and instead develop joint pain and stiffness, particularly in the hands, wrists, and knees. This joint pain can linger for weeks or, in some cases, several months.
Managing Symptoms at Home
Since there’s no cure for the virus itself, treatment is about relieving discomfort. Over-the-counter pain relievers like acetaminophen or ibuprofen can help with fever, headaches, and joint pain. Follow the dosing instructions on the package carefully, especially for children. Naproxen is another option for adults dealing with persistent joint soreness.
Beyond medication, the basics matter. Rest when you feel fatigued. Drink plenty of fluids, particularly during the fever stage. Cool baths or a damp cloth on the skin can soothe itching from the rash. The rash itself doesn’t need any topical treatment. It’s not dangerous and will fade on its own, though it can temporarily reappear for weeks afterward when triggered by sunlight, hot baths, or exercise.
Why the Rash Keeps Coming Back
One of the most confusing things about fifth disease is that the rash can seem to return after it has faded. Heat, physical activity, sun exposure, and even emotional stress can cause the lacy rash to flare up again. This doesn’t mean the infection is back or getting worse. The virus has already been cleared by this point. The recurring rash is just a skin reaction, and it can come and go for several weeks. No additional treatment is needed when this happens.
When Fifth Disease Is More Serious
For most healthy children and adults, fifth disease is mild and unremarkable. But for certain groups, the virus can cause real problems because of how it affects red blood cell production.
People with blood disorders like sickle cell disease are at risk for a complication called transient aplastic crisis. The virus temporarily shuts down the bone marrow’s ability to make new red blood cells. For someone whose red blood cells already break down faster than normal, this can cause a dangerous drop in blood counts and severe anemia. These patients may need hospitalization and blood transfusions. They also remain contagious longer than healthy individuals, staying infectious until their blood counts recover.
People with weakened immune systems face a similar challenge. Their bodies may struggle to clear the virus, leading to prolonged infection and chronic anemia. They can also remain contagious for an extended period.
Fifth Disease During Pregnancy
Pregnant women who haven’t had fifth disease before should take exposure seriously. The virus can cross the placenta and interfere with the baby’s red blood cell production. Infection during the first half of pregnancy carries the greatest risk, potentially causing severe fetal anemia and, in some cases, miscarriage.
If you’re pregnant and have been exposed to someone with fifth disease, or if you develop a new rash or joint pain, contact your healthcare provider. A blood test can check for antibodies to determine whether you’ve been recently infected or are already immune from a past infection. If the initial blood test shows no immunity and no current infection, a repeat test about three weeks later can confirm whether you were infected during that window.
Pregnant women with confirmed infection are typically monitored more closely with additional prenatal visits, blood tests, and ultrasounds to watch for signs of fetal anemia. In some cases, specialized procedures may be considered to reduce the risk of complications.
How Diagnosis Works
Most cases of fifth disease in children are diagnosed just by looking at the rash. The slapped-cheek appearance is distinctive enough that no testing is needed. In adults, where the rash may be absent or subtle, or in high-risk situations like pregnancy, a blood test can confirm the diagnosis.
The test looks for two types of antibodies. One type (IgM) appears about 10 to 12 days after infection and signals a recent or active infection. The other type (IgG) shows up around two weeks after infection and stays in your blood for life, serving as a marker of past infection and immunity. By the time the classic rash appears, about 90% of patients already have detectable IgM antibodies. If both antibody types come back negative, there’s no evidence of current or past infection, which is useful information for pregnant women trying to understand their risk.
Preventing the Spread
Because the virus spreads through respiratory droplets before the rash appears, preventing transmission is tricky. You’re most contagious during the early cold-like phase, when the illness looks like any other mild upper respiratory infection. By the time the telltale rash shows up and you realize it’s fifth disease, the contagious window has largely passed.
The standard precautions still help: frequent handwashing, covering coughs and sneezes, and avoiding sharing utensils or cups. There is no vaccine available for parvovirus B19, and no medication can prevent infection after exposure. If you know you’ve been around someone with fifth disease and you fall into a high-risk group, the most useful step is getting tested to know your immune status and monitoring for symptoms.