CMV Is a Greater Threat to Infants
Than Zika, but Far Less Often Discussed
Three-year-old Evelyn Steadman of Crete, Ill., was
born with the CMV virus and has microcephaly and deafness.
Credit Whitten Sabbatini for The New York Times
Laura Sweet had no idea that she had contracted a virus that would leave
her daughter, Jane, deaf by her first birthday.
During her second
pregnancy, doctors had warned her against alcohol and changing kitty
litter. They had said to avoid sushi and cold cuts. But nobody — not her
obstetrician, nor her
midwife — mentioned
cytomegalovirus.
Only after a frustrating search lasting months did doctors discover that
the girl had been infected in utero. The infection and the emotional
ordeal that followed, she thinks, could have been prevented — for the
Sweet family and thousands of others every year.
“It’s tough to play the what-if game,” said Ms. Sweet, 37, a consultant
for an education nonprofit in Cumberland, Me. “You can drive yourself
crazy with that.”
The world has been galvanized by the
Zika epidemic
spreading through the Americas, which has left more than 2,000 infants
with severe brain damage. But for pregnant women and their infants in
the United States, cytomegalovirus, or CMV, is the far greater viral
threat.
Every year, 20,000 to 40,000 infants are born with CMV. At least 20
percent — up to 8,000 — have or develop permanent disabilities, such as
hearing loss,
microcephaly, intellectual deficits and vision abnormalities. There
is no vaccine or standard treatment.
But there are now hints that some newborns may benefit from antiviral
drugs, a finding that has reinvigorated the debate over whether they
should be routinely screened for the infection.
CMV is the most common congenital viral infection and the leading
nongenetic cause of deafness in children. Roughly 400 children die from
it annually. By contrast,
roughly 900 pregnant women in the continental United States have
contracted the
Zika virus.
“Everyone and their brother knows about Zika, but it’s very rare in the
U.S.,” said Dr. Mark R. Schleiss, the director of pediatric
infectious diseases at the University of Minnesota Medical School.
CMV should be every bit as urgent a priority as Zika, he argues.
Health officials called for a vaccine decades ago, and there still isn’t
one, partly because of a lack of public awareness about CMV, Dr.
Schleiss said.
CMV is a hardy member of the
herpes family, and it is transmitted by contact with saliva and
urine — often from diaper-wearing children to adults. Pregnant women
often get it from toddlers, especially those in day care who share
drool-drenched toys.
“Toddlers are hot zones for CMV,” said Dr. Gail Demmler-Harrison, a
pediatric infectious disease specialist at Baylor College of Medicine in
Houston. It is difficult for mothers to protect themselves from a virus
carried by the children they care for.
Nearly one in three children is infected by age 5, and more than
half of adults by 40. CMV takes up permanent residence in the body and
can cause illness again after being dormant. Like the Zika virus, it
causes mild flulike symptoms, or none — but can be devastating to a
fetus.
Had she known any of that while pregnant, Ms. Sweet might have reduced
her chances of contracting CMV with diligent hand-washing, especially
after diaper changes, and not sharing utensils or food with her son,
Henry, then 2 and in day care.
“If there was awareness about CMV, at least women working in day care
and women with toddlers could potentially modify some behavior,” Ms.
Sweet said.
By contrast, doctors and public health officials have advised American
women to take every imaginable precaution against Zika.
Rebekah McGill, a speech language pathologist in Greeneville, Tenn.,
gave birth to a stillborn daughter, Elise, at almost 39 weeks, later
discovering that CMV was the likely reason. Ms. McGill was inconsolable
— and angry that she had never been warned about the virus during any of
her four pregnancies.
“Sometimes, I wonder if our daughter would still be alive if I had only
known,” she said.
A Debate About Discussing
The American College of Obstetricians and Gynecologists used to
encourage counseling for pregnant women on how to avoid CMV.
But last year, the college reversed course, saying, “Patient
instruction remains unproven as a method to reduce the risk of
congenital CMV infection.”
Some experts argue that because there is no vaccine or proven treatment,
there is no point in worrying expecting women about the virus. Instead,
Dr. Christopher Zahn, the vice president for practice at ACOG, said
doctors must focus on conditions with proven interventions and let
patients dictate the discussion.
“There are so many topics to cover during pregnancy that this is often
driven by what patients are most worried about,” he said.
But pregnant women don’t worry about CMV only because they don’t know
about it, some researchers say. They argue that it is high time to carry
out education campaigns and infant screening for the infection, arguing
that it smacks of paternalism to do otherwise.
Dr. Demmler-Harrison, the infectious disease specialist, said she was
“livid” about ACOG’s decision.
“I am baffled why obstetricians do not feel it is important or even
worthy to educate pregnant women about CMV,” she said. “It’s a missed
opportunity to save a baby from the devastating effects of CMV,
including death in the womb and permanent disabilities.”
A study in a French hospital found five to 10 minutes of counseling
about CMV prevention resulted in fewer women contracting the virus. In
another study, pregnant mothers shown a video and offered hygiene tips
were much less likely to get CMV (5.9 percent) than those not given
information on prevention (41.7 percent).
“It’s as if doctors are saying, ‘I’m going to cherry-pick what you know
and you don’t know,’” said Erica Steadman, 30, a digital marketing
manager in Crete, Ill., who says her obstetricians never mentioned the
virus.
Her 3-year-old daughter, Evelyn, was born with microcephaly, deafness
and such high levels of CMV in her urine that doctors were surprised she
survived. “Withholding information is the same as putting pregnant women
and their children in danger,” Mrs. Steadman said.
Guidelines from ACOG suggest that pregnant women will find CMV
prevention “impractical and burdensome,” especially if they are told not
to kiss their toddlers on the mouth — a possible route of transmission.
But Kim Hill, a mother of four in Raleigh, N.C., did not find it that
hard. Her second daughter, Kaitlyn, now 7, was born with signs of CMV
infection and became hearing-impaired. So when she became pregnant with
twins, Ms. Hill stopped sharing food with her kids and regularly
scrubbed her hands.
“People canceled trips and rearranged their whole lives not to travel to
Zika areas,” Mrs. Hill said. “All we are saying is, wash your hands.”
A Push to Screen
In most states, babies are not universally screened at birth for CMV
infection, on the grounds that most won’t be injured by the virus and
clinicians don’t want to worry parents unnecessarily. The consequences
of infection are often not detected until months or years after
delivery.
“A common scenario is a child is born who looks completely normal, and
who may or may not pass the newborn hearing screening, and then as they
age, at 6 months or 12 months or older, hearing becomes an issue,” said
Dr. Albert H. Park, the chief of pediatric otolaryngology at the
University of Utah.
Now some experts are pushing for routine screening of newborns for CMV.
The idea is to identify those who are infected in the first 21 days so
that they can be given regular hearing tests, an
eye test, a
magnetic resonance imaging test of the brain, and perhaps antiviral
treatment.
It remains unclear how and why CMV causes hearing loss. But infants who
receive a timely diagnosis can be given
hearing aids or access to early-intervention programs to have the
best chance of learning to talk.
In January,
Connecticut began testing any infant who failed a hearing screening
for CMV infection, and
Illinois now offers parents the option.
Utah was the first state, in 2013, to carry out CMV screening of
newborns who did not pass hearing tests.
After she learned that CMV had caused her daughter Daisy’s deafness,
Sara Doutré and her mother, Ronda Menlove, then a legislator in Utah,
worked to get the law in place so “no other baby fell through the cracks
in the system,” Mrs. Doutré said.
The Centers for Disease Control and Prevention is funding a pilot study
that aims to universally screen 30,000 newborns in Minnesota for CMV as
part of an existing program in the state health department, Dr. Schleiss
said.
The screening question has taken on much greater importance with a
recent discovery.
A study published in The
New England Journal of Medicine last year found that infants with
CMV symptoms at birth who took an antiviral drug for six months had
moderately better hearing at 2 years, compared with newborns who took it
for six weeks.
The six-month group also performed better on a test intended to assess
cognitive, communication and motor skills. The finding suggests that the
roughly 10 percent of babies born with multiple symptoms of CMV
infection, like brain abnormalities and hearing loss, could benefit from
antiviral drugs.
The finding does not apply to infected infants without symptoms at
birth, experts noted, and it’s not yet known whether antiviral
medication is safe and effective in babies whose only symptom is hearing
loss.
In Maine, Jane Sweet, almost 2, now wears
cochlear implants. Because of early-intervention services like
physical therapy, she walked at 16 months.
Still, it’s not clear what the future holds. CMV infection left
abnormalities in Jane’s brain, which may presage developmental troubles.
“We won’t know until she’s in school if she has learning delays,” Ms.
Sweet said.
A version of this article appears in print on October 25, 2016, on page D1 of
the New York edition with the headline: An
Unspoken Threat.