Human Parechovirus (PeV): Symptoms, Transmission, and Infant Safety Guide
Updated: 3 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
Quick Answer: Parechovirus at a Glance
Human parechovirus (PeV) is a virus that poses the greatest risk to infants younger than 3 months, especially newborns [1] [2]. Common symptoms are fever, irritability, rash, poor feeding and respiratory symptoms, and severe complications include sepsis, meningitis, encephalitis and seizures [1]. It spreads through respiratory droplets and the fecal-oral route [1] [2]. There is no vaccine, so handwashing and disinfection are key [1].
What the research says
Different types cause different illness. A review in Clinical Microbiology Reviews notes that human parechovirus is currently divided into 19 genotypes. HPeV-1 is the most common and usually causes stomach and respiratory illness, while HPeV-3 is the clinically most important type because it is linked to severe disease in younger infants. In young infants the typical picture is fever, severe irritability, and rash. The authors recommend adding molecular testing to the workup of sepsis-like illness and central nervous system infection in this age group. (Olijve et al., Clin Microbiol Rev, 2017) [3]
Brain infection can have lasting effects in some children. A systematic review and meta-analysis of 20 studies of neonates and young children with parechovirus infection of the central nervous system found neurological sequelae in about 5% of children during short-term follow-up (95% CI 3–8%), rising to 27% during long-term follow-up (95% CI 17–40%). Suspected neurodevelopmental delay was seen in 9% or more during long-term follow-up. The studies varied widely and had methodological limits, so the authors advise interpreting the results with caution and recommend long follow-up. (van Hinsbergh et al., Lancet Child Adolesc Health, 2020) [4]
What Is Human Parechovirus (PeV)?
Human parechovirus (PeV) belongs to the Picornaviridae family of viruses, the same family as enteroviruses [1] [2]. It is found around the world and tends to be more common in the summer and fall [1] [2]. There are multiple types and subtypes, and PeV-A3 is the most common [1].
For most people, including older children and adults, PeV causes a mild illness, such as a rash, vomiting, or a cold-like infection, or no symptoms at all [1]. In newborns, particularly in the first couple of weeks of life, and in babies younger than six months, it can cause much more serious illness [1].
How Does Parechovirus Affect an Infant's Body?
In infants younger than three months, PeV can make a baby very ill and cause life-threatening complications that need immediate medical care [1]. These include:
Emergency alert: If your baby is weak, has a high fever, can't feed, or has trouble breathing, go to the emergency room right away [1].
Sepsis: a severe blood infection that can spread to all organs and cause swelling, organ failure, and death [1].
Meningitis: an infection of the protective lining around the brain and spinal cord [1].
Encephalitis: inflammation of the brain [1].
Seizures: uncontrolled surges of electrical activity in the brain, which may involve uncontrolled muscle movements [1].
Recognizing the Symptoms of PeV
Symptoms range from mild to severe, and some infections cause no visible symptoms at all [1]. Older children may have only a cold-like illness, but parents should watch for the signs below in babies.
Symptom category | Common signs |
Skin changes | Rash on the hands and feet; patchy, discolored (mottled) skin [1] |
Behavior and feeding | Irritability; poor feeding or sucking [1] |
Muscle tone | Weak muscle tone, often described as a "floppy" baby [1] |
Whole-body signs | Fever, fast heart rate, and low blood pressure [1] |
Respiratory | Upper respiratory infection [1] |
Digestive | Nausea, vomiting, and diarrhea [1] |
How Is Parechovirus Spread?
Parechovirus is contagious and spreads through close contact, through the air in respiratory particles after a cough or sneeze, and through the fecal-oral route [1]. Household spread is common [1], and daycare settings are also a risk [1]. People can spread the virus even when they have no symptoms [1] [2].
The respiratory route involves contact with saliva or nasal discharge, for example through coughing, sneezing, or sharing cups and toys. The virus stays in the respiratory tract for one to three weeks after infection [1] [2].
The fecal-oral route occurs when microscopic particles of contaminated stool enter another person's mouth, often through poor hand hygiene after a diaper change or a trip to the toilet. The stool does not have to look dirty. Notably, the virus can be found in stool for up to six months after infection [1] [2], so a person can keep spreading it long after symptoms are gone.
Diagnosis and Treatment Options
Because many viruses cause similar symptoms, a provider will often simply tell you that your child has a "virus." If a baby is sick enough to be hospitalized, doctors examine the baby and test body fluids to find the cause. The most common test is a PCR test, which detects the virus's genetic material [1]. Samples can come from the blood, stool, respiratory material from the nose or throat, or the fluid around the brain and spinal cord (cerebrospinal fluid) [1]. The CDC encourages clinicians to consider PeV in infants with fever, sepsis-like illness, or seizures or meningitis when no other cause is found [2].
Management Strategies
There is no specific treatment or vaccine for parechovirus, and most people who are infected don't get very sick [1] [2]. If a newborn becomes seriously ill, doctors may try the following, and treatment is most effective when the baby is diagnosed early [1]:
Immunoglobulins: an intravenous (IV) medicine given into a vein to boost the baby's immune system [1].
Pleconaril: an oral antiviral medicine to help fight the infection [1].
Hospital care: many sick infants need to stay in the hospital until their symptoms improve, and some need the intensive care unit [1].
After treatment, it can take about three to 10 days for a baby to feel better, depending on how severe the illness was [1].
Prevention: Protecting Your Family
There is no vaccine, so prevention depends on hygiene and avoiding exposure [1]. These steps matter most if you have a newborn at home or are around pregnant women.
Wash your hands thoroughly. Use soap and water for at least 20 seconds, especially after changing diapers or using the toilet and before eating [1].
Disinfect surfaces. Regularly clean frequently touched surfaces and objects [1] such as doorknobs, toys, and countertops.
Use hand sanitizer when needed. When soap and water aren't available, use a sanitizer with at least 60% alcohol [1] [2].
Cover coughs and sneezes [1]. Cover your nose and mouth with a tissue or your elbow.
Stay away from people who are sick. Keep infants away from anyone showing signs of illness [1], even a "mild" cold.
The Bottom Line
Parechovirus is a common part of childhood, but it can be serious in babies younger than three months [1]. Washing hands well and often, limiting a young baby's exposure to sick people, and knowing the warning signs can lower the risk. If a baby has a fever, seems weak or very irritable, can't feed, or has trouble breathing, get medical care immediately.
Frequently Asked Questions
Can adults get parechovirus?
Yes. Adults can be infected, but they usually have very mild symptoms or none at all [1]. They can still unknowingly pass the virus to vulnerable infants.
How long is a person contagious?
The virus stays in the respiratory tract for one to three weeks and can be found in stool for up to six months after infection [1] [2]. A person is most contagious while they have symptoms but can keep shedding the virus for months [1].
Is parechovirus the same as a common cold?
It can cause cold-like symptoms such as an upper respiratory infection, but it is a different virus, and it can make babies younger than three months very sick [1].
What does "mottled skin" look like?
Mottled skin looks patchy and discolored [1], often with a marbled pattern. It is one of the signs of PeV in babies [1].
Can parechovirus be passed to a baby before birth?
It may be. Cleveland Clinic notes that the virus may also be spread to the fetus before birth [1].
Is there a specific time of year when PeV is more common?
What is PeV-A3?
It is the most common type of human parechovirus [1] and the type most often linked to severe disease in young infants [2]. In the CDC's 2022 health advisory, all PeV-positive specimens typed at the CDC were PeV-A3 [2].
How soon will a baby feel better after treatment?
It can take about three to 10 days after treatment, and the hospital stay depends on how severe the illness is [1].
What is the best way to clean my hands to prevent parechovirus?
Wash with soap and water for at least 20 seconds, especially after diaper changes or using the toilet [1], before eating or feeding, and whenever hands look dirty [2]. When soap and water aren't available, use a hand sanitizer with at least 60% alcohol [1] [2].
Are there long-term effects after PeV infection of the brain?
Some children can have lasting effects after a central nervous system infection. A meta-analysis found neurological sequelae in about 5% of children in the short term and 27% in the long term [4], although the studies varied and the results should be read with caution [4]. This is why long follow-up is recommended [4].
Why don't doctors always test for PeV?
Most children have a mild illness, and common illnesses are not routinely tested for a specific virus [1]. Testing is usually done for young infants who are sick enough to be hospitalized, and the CDC encourages testing infants with fever, sepsis-like illness, or seizures or meningitis without another known cause [2].
How can I protect my young baby from exposure?
If your baby is younger than six months, wash your hands well and often and avoid exposing your baby unnecessarily to other children and adults, especially anyone who is sick [1].
What is the "floppy baby" symptom?
It refers to weak muscle tone [1], or hypotonia, in which a baby feels unusually limp when held.
Is parechovirus related to polio?
They belong to the same large virus family, Picornaviridae, but they are different viruses.
Is there a vaccine for parechovirus?
No. There is no vaccine, so prevention relies on good hygiene and avoiding contact with people who are sick [1].
When should I take my baby to the emergency room?
Go right away if your baby is weak, has a high fever, can't eat, or has trouble breathing [1]. If you suspect PeV in a young baby, see a healthcare provider immediately [1].
References
Cleveland Clinic. Human Parechovirus (PeV). Cleveland Clinic. Updated July 19, 2022. https://my.clevelandclinic.org/health/diseases/23496-parechovirus
Centers for Disease Control and Prevention. Recent Reports of Human Parechovirus (PeV) in the United States—2022. CDC. Updated July 11, 2022. https://archive.cdc.gov/www_cdc_gov/han/2022/han00469.html
Olijve L, et al. Human Parechovirus: an Increasingly Recognized Cause of Sepsis-Like Illness in Young Infants. Clin Microbiol Rev. 2017;31(1):e00047-17. PMID 29142080. https://doi.org/10.1128/CMR.00047-17
van Hinsbergh TMT, et al. Neurological and neurodevelopmental outcomes after human parechovirus CNS infection in neonates and young children: a systematic review and meta-analysis. Lancet Child Adolesc Health. 2020;4(8):592-605. PMID 32710840. https://doi.org/10.1016/S2352-4642(20)30181-4
Medical disclaimer
This article is for general informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for diagnosis and treatment decisions. A baby younger than three months with a fever, weakness, poor feeding, or trouble breathing needs urgent medical care.
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