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PubMed This is a summary of 19 peer-reviewed journal articles Updated
Pediatrics · Congenital Cytomegalovirus

Congenital CMV in Newborns: Symptoms, Treatment & Long-Term Monitoring

At a Glance

Congenital CMV is a viral infection passed to a baby during pregnancy. Diagnosis requires a PCR test within the first 21 days of life. Treatment for symptomatic babies typically involves six months of an antiviral medication called valganciclovir to protect long-term hearing and development.

When a baby is diagnosed with congenital Cytomegalovirus (cCMV), it means the virus was passed from the mother to the baby during pregnancy. While many babies with cCMV appear healthy at birth, the virus can lead to long-term health challenges. Understanding the timeline for diagnosis and the steps for treatment can help you advocate for the best care for your child.

The 21-Day Diagnostic Window

Timing is the most critical factor in a cCMV diagnosis. To confirm that the infection is “congenital” (present at birth), a baby must be tested within the first 21 days of life [1].

  • The Test: Doctors use a PCR test to look for viral DNA in the baby’s saliva or urine [2].
  • Why 21 Days? If a baby tests positive after 21 days, it is impossible to know if they were born with the virus or if they caught it after birth (for example, through breast milk or contact with others) [3]. Postnatal infection (after birth) is very common and rarely causes long-term health problems, whereas congenital infection requires careful monitoring [1].

Symptomatic vs. “Asymptomatic”

Babies with cCMV are generally grouped into two categories, though the line between them can sometimes blur.

  • Symptomatic: These infants show clear signs of infection at birth, such as a small head (microcephaly), a characteristic purple rash (“blueberry muffin spots”), or liver issues [4][5].
  • Asymptomatic: These babies look perfectly healthy on the outside and pass their initial physical exams. However, about 30% of these “asymptomatic” babies may actually have “hidden” signs of the virus, such as small brain abnormalities that can only be seen on an MRI or ultrasound [6].

Treatment with Valganciclovir

For babies who have symptoms or brain abnormalities, doctors typically recommend an antiviral medication called valganciclovir [7].

  • Duration: The standard treatment is an oral liquid taken twice daily for 6 months [8].
  • Benefits: Starting this treatment early (usually within the first month of life) has been shown to improve long-term hearing and neurodevelopmental outcomes [9][10].
  • Side Effects: The most common side effect is neutropenia, which is a drop in a specific type of white blood cell that helps fight infections [11]. Because of this, your baby will need regular blood tests to ensure their immune system remains strong [8].
  • Safety and Handling: Valganciclovir is a potent medication and can be hazardous (teratogenic). Caregivers, especially those who are pregnant, should never allow the liquid to touch their bare skin. If it does, wash it off immediately with soap and water [8].
  • Viral Shedding Warning: Babies with cCMV will shed the virus in their urine and saliva for years. Caregivers must practice rigorous handwashing, especially after diaper changes, to protect themselves and others from infection [1].

Long-Term Monitoring: The Roadmap

Because CMV can be a “progressive” virus—meaning it can cause new problems over time—long-term follow-up is essential for all babies with cCMV, even those who appear healthy at birth.

Area of Concern Why it Matters Typical Schedule
Hearing CMV is the leading cause of non-genetic sensorineural hearing loss (SNHL). It can be late-onset or get worse over time [12]. Every 3–6 months for the first year, then annually through early childhood [13].
Vision The virus can cause inflammation in the back of the eye (chorioretinitis) [14]. Baseline exam at birth, then as recommended by an ophthalmologist [15].
Development CMV can affect motor skills, balance (vestibular function), and learning [16][17]. Regular checks with a pediatrician or developmental specialist [18].

Even if your child passes their newborn hearing screen, they still need these follow-up tests. About 7% to 15% of babies who are asymptomatic at birth will develop hearing loss later in childhood [19]. Early detection is key to ensuring they receive the support they need to thrive.

Common questions in this guide

Why is the 21-day testing window for congenital CMV so important?
Testing a baby for CMV within the first 21 days of life is crucial to confirm the infection was present at birth. If tested later, doctors cannot accurately determine whether the virus was passed during pregnancy or acquired after birth.
What is the difference between symptomatic and asymptomatic cCMV?
Symptomatic babies show clear physical signs of the virus at birth, such as a small head or a specific rash. Asymptomatic babies appear perfectly healthy but may still have hidden brain abnormalities that can only be detected by an MRI or ultrasound.
How is congenital CMV treated in newborns?
Babies with symptoms or brain abnormalities are typically treated with a liquid antiviral medication called valganciclovir. Treatment usually lasts for six months and requires careful blood monitoring to ensure the baby's immune system remains strong.
Will a baby with congenital CMV experience hearing loss?
Yes, CMV is a leading cause of non-genetic hearing loss in children. Even babies who pass their newborn hearing screen can develop late-onset hearing loss, making regular hearing tests essential through early childhood.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Was my baby's CMV diagnosis confirmed within the 21-day window? If not, how can we be sure it is congenital?
  2. 2.Does my baby have any 'hidden' signs of the virus, like brain abnormalities on an MRI, that would change their status from asymptomatic to symptomatic?
  3. 3.If we start valganciclovir, how often will we need to check my baby's blood counts to monitor for side effects like neutropenia?
  4. 4.What is the specific schedule for hearing tests over the next few years, and how will we know if the hearing loss is progressing?
  5. 5.When should my baby have their first eye exam to check for CMV-related vision issues?
  6. 6.Are there specific developmental milestones I should be watching for that might be affected by cCMV?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (19)
  1. 1

    Outcome and management of newborns with congenital cytomegalovirus infection.

    Nicloux M, Peterman L, Parodi M, Magny JF

    Archives de pediatrie : organe officiel de la Societe francaise de pediatrie 2020; (27(3)):160-165 doi:10.1016/j.arcped.2020.01.006.

    PMID: 32127242
  2. 2

    Diagnostic Performance of Salivary PCR for the Detection of Congenital Cytomegalovirus: A Systematic Review and Meta-Analysis.

    Rady SMA, Abdelmoati MI, Sabra S, et al.

    Viruses 2025; (17(9)) doi:10.3390/v17091253.

    PMID: 41012680
  3. 3

    Epidemiology of cytomegalovirus Infection among mothers and infants in Colombia.

    Rico A, Dollard SC, Valencia D, et al.

    Journal of medical virology 2021; (93(11)):6393-6397 doi:10.1002/jmv.26815.

    PMID: 33475162
  4. 4

    [Neurological sequelae in patients with congenital cytomegalovirus].

    de Juan Gallach A, Alemany Albert M, Marco Hernández AV, et al.

    Anales de pediatria 2020; (93(2)):111-117 doi:10.1016/j.anpedi.2019.12.021.

    PMID: 32111550
  5. 5

    Congenital Cytomegalovirus and Hepatic Failure: An Underrecognized Complication.

    Souder JP, Grimm E, Pinninti S, et al.

    The Pediatric infectious disease journal 2022; (41(2)):e49-e53 doi:10.1097/INF.0000000000003381.

    PMID: 34694253
  6. 6

    Brain MRI findings in newborns with congenital cytomegalovirus infection: results from a large cohort study.

    Vande Walle C, Keymeulen A, Schiettecatte E, et al.

    European radiology 2021; (31(10)):8001-8010 doi:10.1007/s00330-021-07776-2.

    PMID: 33787973
  7. 7

    Clinical outcome and the role of antivirals in congenital cytomegalovirus infection.

    Ross SA, Kimberlin D

    Antiviral research 2021; (191()):105083 doi:10.1016/j.antiviral.2021.105083.

    PMID: 33964331
  8. 8

    Hematologic Adverse Events Associated With Prolonged Valganciclovir Treatment in Congenital Cytomegalovirus Infection.

    Ziv L, Yacobovich J, Pardo J, et al.

    The Pediatric infectious disease journal 2019; (38(2)):127-130 doi:10.1097/INF.0000000000002079.

    PMID: 29677086
  9. 9

    Congenital Cytomegalovirus Infection: Update on Diagnosis and Treatment.

    Chiopris G, Veronese P, Cusenza F, et al.

    Microorganisms 2020; (8(10)) doi:10.3390/microorganisms8101516.

    PMID: 33019752
  10. 10

    Treatment of congenital cytomegalovirus beyond the neonatal period: an observational study.

    Dorfman L, Amir J, Attias J, Bilavsky E

    European journal of pediatrics 2020; (179(5)):807-812 doi:10.1007/s00431-019-03558-7.

    PMID: 31927626
  11. 11

    Changes in Neutrophil Count During Valganciclovir Therapy for Symptomatic Congenital Cytomegalovirus Infection.

    Kawamura A, Abe S, Shirai K, et al.

    Biomedicines 2025; (13(7)) doi:10.3390/biomedicines13071739.

    PMID: 40722810
  12. 12

    Congenital cytomegalovirus infection diagnostics and management.

    Pinninti S, Boppana S

    Current opinion in infectious diseases 2022; (35(5)):436-441 doi:10.1097/QCO.0000000000000874.

    PMID: 35984001
  13. 13

    Cytomegalovirus-A Risk Factor for Childhood Hearing Loss: A Systematic Review.

    Vos B, Noll D, Whittingham J, et al.

    Ear and hearing 2021; (42(6)):1447-1461 doi:10.1097/AUD.0000000000001055.

    PMID: 33928914
  14. 14

    Congenital cytomegalovirus retinitis of prematurity: a case report and literature review.

    Li Y, Sun W, Jin X, et al.

    Frontiers in pediatrics 2025; (13()):1558820 doi:10.3389/fped.2025.1558820.

    PMID: 40248023
  15. 15

    From diagnosis to management: current perspectives on congenital cytomegalovirus infection.

    Buchfellner M, Ross S

    Current opinion in infectious diseases 2024; (37(4)):232-237 doi:10.1097/QCO.0000000000001023.

    PMID: 38748563
  16. 16

    Vestibular Dysfunction in Pediatric Patients With Congenital Cytomegalovirus Infection and Hearing Loss: Occurrence and Characteristics.

    Zhou G, Peterson H, Yun A, Brodsky J

    Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology 2025; (46(9)):1124-1128 doi:10.1097/MAO.0000000000004600.

    PMID: 40690203
  17. 17

    Long-term impairment attributable to congenital cytomegalovirus infection: a retrospective cohort study.

    Korndewal MJ, Oudesluys-Murphy AM, Kroes ACM, et al.

    Developmental medicine and child neurology 2017; (59(12)):1261-1268 doi:10.1111/dmcn.13556.

    PMID: 28990181
  18. 18

    Insight Into Long-term Neurodevelopmental Outcomes in Asymptomatic Congenital CMV Infection.

    Boppana SB, Fowler KB

    Pediatrics 2017; (140(5)) doi:10.1542/peds.2017-2526.

    PMID: 29066579
  19. 19

    Usefulness of a flow chart for targeted screening of congenital cytomegalovirus-related hearing loss.

    Ciccia M, Monari C, Vitagliano G, et al.

    Journal of neonatal-perinatal medicine 2018; (11(3)):339-343 doi:10.3233/NPM-17110.

    PMID: 30040746

This page provides educational information about congenital CMV in newborns. It does not replace professional medical advice. Always consult your pediatrician for diagnosis and treatment decisions for your child.

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