Six Pennsylvania Babies Were Born Already Infected With Measles

Doctors in Pennsylvania estimate at least six babies have been born already infected with measles, and two of them needed intensive care. Clinicians described those cases on Sept. 24 as congenital measles, an illness they say they have rarely, if ever, treated in the United States.

The infants had no shot to refuse. Measles vaccine is withheld in pregnancy, and the first routine dose waits until age 1, so the virus has reached the patients who cannot be vaccinated at all.

At Least Six Newborns, Two in Intensive Care

Congenital measles happens when a pregnant patient gets measles near delivery and the virus passes to the baby before or during birth. Dr. John Goldman, an infectious disease specialist at the University of Pittsburgh Medical Center, said clinicians are now seeing forms of measles they barely had to manage when almost every mother already had immunity.

“Because of this, we’re literally seeing new forms of measles,” Goldman said. “We don’t have a lot of information about what happens with it.”

The statewide outbreak around those births is no longer a county cluster. On Sept. 23, the Pennsylvania Department of Health reported 835 measles cases across 39 counties, with 43 of those confirmed since Sept. 21. The tally includes 164 hospitalizations and four measles-associated deaths. Only four patients, less than 1%, were fully vaccinated.

THE PENNSYLVANIA TALLY

• Born infected: At least six newborns, with two in intensive care, as of Sept. 24.
• Confirmed cases: 835 people in 39 of the state’s 67 counties as of Sept. 23.
• Hospital care: 164 patients, or 19.6% of confirmed cases.
• Deaths: Four measles-associated deaths, two of them in infants too young for MMR.

Lancaster County still holds the center of gravity, with 342 cases, or 41% of the state total. Mifflin County has 94 and Chester County has 78. About a third of confirmed infections are in people under 18. The rest are mostly adults, including pregnant patients who have no live-vaccine option once a pregnancy is underway.

Why Pregnant Patients Cannot Take the Shot

MMR is a live vaccine. The Centers for Disease Control and Prevention says it should not be given to anyone known to be pregnant, and that people should wait 28 days after a dose before trying to conceive. Close contacts of a pregnant patient can still be vaccinated. The pregnant patient cannot.

That gap is the whole perinatal problem. If measles reaches a household, the fetus depends on antibodies the mother already has. An unvaccinated mother who never had measles has none to pass along, and she cannot start that protection after she is pregnant.

CDC clinicians define congenital measles as a febrile rash within 10 days of birth in a newborn whose mother was infected late in pregnancy. The timing is the point of the diagnosis: a rash that early means the baby was infected before delivery, not in the nursery afterward.

Historical reports put vertical transmission at about 25% to 30% when the mother is infected in the days around birth. The American College of Obstetricians and Gynecologists lists measles risks for mother and fetus that include pneumonia, pregnancy loss, preterm delivery, and low birth weight. CDC guidance adds that congenital infection can cause encephalitis and death, and that it raises the later risk of a fatal brain disease called subacute sclerosing panencephalitis, or SSPE.

Dr. Manish Trivedi, head of infectious diseases at AtlantiCare, said congenital measles typically shows up with fever and rash in the first 10 days of life and can cause pneumonia, encephalitis, or death. If measles keeps spreading, he said, more pregnant patients will be exposed.

WHO CANNOT GET MMR RIGHT NOW

• Pregnant patients: Live MMR is withheld for the length of the pregnancy.
• Infants under 1: The first routine dose is not given until 12 months of age.
• People with some immune problems: Live vaccine is often barred, so they also depend on everyone around them.

Up to 9 in 10 susceptible people in close contact with a measles patient get infected. The virus can hang in air or on surfaces for up to two hours after the sick person leaves. A labor unit, a waiting room, or a midwife’s clinic is a hard place to outrun that math.

Coverage at 93% Still Leaves Nursery Gaps

Statewide school numbers look closer to the national average than the outbreak map does. Johns Hopkins’ International Vaccine Access Center, using CDC school survey data, found that 93% of Pennsylvania kindergartners had MMR in the 2025-26 year, against 92.4% nationwide.

Measles control is usually described as needing about 95% immunity in a community. Kindergarten coverage is a school-entry snapshot, not a map of Amish and Mennonite settlements, home births, or adults who skipped childhood doses. The outbreak has fed on those pockets, not on the statewide average.

Pennsylvania allows medical, religious, and personal-belief exemptions. For 2025-26, 5.7% of the state’s kindergartners had an exemption on file: 3.2% religious, 2.2% philosophical, and 0.3% medical. CDC figures put the national share exempt from one or more vaccines at 4.2% that same year.

Two doses of MMR are 97% effective at preventing measles. That figure describes people who got both shots. It does not describe a fetus. It does not describe a 6-week-old. And it does not describe a laboring patient who is already sick.

Lancaster County’s Fight Over a Newborn Death

The first two measles-associated deaths Pennsylvania had recorded in 35 years were both infants in Lancaster County, and both were too young for MMR. That fact got lost almost immediately in an argument about labels.

THE DEATHS ON THE STATE LIST

1. August 14, 2026: A newborn boy dies shortly after birth at a Strasburg Township birthing center. His mother is severely ill with measles. Lung tissue later shows measles infection acquired before birth. The immediate cause listed by the coroner is a lacerated spleen.
2. August 18, 2026: A 6-week-old girl dies at home. She has Amish lethal microcephaly, a rare genetic condition that leaves infants open to respiratory infection. Lancaster County Coroner Dr. Stephen Diamantoni concludes measles killed her.
3. September 12, 2026: A 40-year-old unvaccinated woman in Jefferson County dies. The coroner, Greg Furlong, cites respiratory failure from measles along with chronic lung disease and asthma.
4. Mid-September 2026: An unvaccinated 18-year-old in Mifflin County dies of acute disseminated encephalomyelitis, a rare neurologic complication of measles. The state confirms a fourth measles-associated death.

The August 14 baby was born with a pulse and was not breathing. Paramedics tried oxygen and chest compressions. He was declared dead in less than half an hour. His mother had been so ill she could speak only in a whisper. Other children in the house had already been sick. The midwife told the family the mother’s measles had killed the child.

Diamantoni has said a pathologist did not treat measles as the cause and did not find an enlarged spleen after it had already ruptured. Pennsylvania Health Secretary Dr. Debra Bogen reviewed the case file and kept the death in the measles-associated column, a label the department uses when lab or epidemiologic evidence of measles is present. Dr. Paul Offit, director of the Vaccine Education Center at Children’s Hospital of Philadelphia, wrote that congenital measles can enlarge the spleen and thin its capsule, which can lead to rupture during birth.

Amesh Adalja, an infectious disease physician, put the laboratory point more sharply after the autopsy details came out: the coroner found measles virus in the newborn’s lungs, acquired before birth. That is congenital infection, not leftover antibody from the mother.

WHERE EXPERTS DISAGREE

• The coroner: Diamantoni lists traumatic rupture of the spleen as the cause and has said measles did not appear to him as the killer.
• The state: Bogen’s department counts the death as measles-associated because the infant was infected before birth and measles can weaken the spleen.
• Federal tally: CDC’s public count listed one U.S. measles death as of Sept. 24, with a note that the number can change, while Pennsylvania lists four.

U.S. Health Secretary Robert F. Kennedy Jr. said in August that the first two deaths might have been fabricated. That claim did not match the lung-tissue result, the mother’s illness, or the later infant death Diamantoni did attribute to measles. What it did do was pull the public fight toward paperwork and away from the nursery.

Four deaths among 835 confirmed cases is about 4.8 per 1,000, above the classic range of 1 to 3 child deaths per 1,000 measles infections. Offit has argued that a ratio that high usually means many milder infections were never counted. Amish families in the Lancaster cluster have said entire households were sick and never swabbed.

Antibody Therapy Is Now a Delivery-Room Drug

There is no FDA-approved antiviral that is a standard measles cure. Care is supportive. For a newborn whose mother had measles around delivery, the extra tool is immunoglobulin, an antibody product given after birth in hopes of blunting the infection.

Adam J. Ratner, a member of the American Academy of Pediatrics Committee on Infectious Diseases, said the Lancaster cases, and congenital measles seen in Canada’s outbreak a year earlier, were why the academy published guidance this fall. Pediatricians have had almost no modern playbook for a baby born with measles.

There’s not a standard practice for any of this.

Adam J. Ratner, MD, MPH, AAP Committee on Infectious Diseases

The academy’s immunoglobulin for newborns exposed at birth advice covers babies born within two weeks of the mother’s measles rash. Ratner said the antibodies are, in effect, the ones the child did not get across the placenta because the mother was not immune. The product can make illness milder. It does not always prevent infection. Historical series put death from congenital measles as high as 30% before antibody treatment was used.

“Children with congenital measles can be quite sick,” Ratner said. “We know it can be dangerous.” Some infected newborns have no rash at all, which is why a baby can be missed if the only test is a glance at the skin.

If a pregnant patient is exposed and has no immunity, immunoglobulin is also the limited option for her. It is not a substitute for being vaccinated before pregnancy. It is what is left after that window closes.

The Brain Disease That Can Wait Years

The intensive-care risk is immediate: pneumonia, encephalitis, bleeding, death in the first days of life. The longer shadow is SSPE, a progressive brain disease that follows measles and is almost always fatal.

CDC describes SSPE as a rare degeneration of the central nervous system that usually appears 7 to 10 years after measles, even when the original illness seemed to clear. Ratner said SSPE is “essentially invariably fatal,” and that children infected very early, including those with congenital measles, have sometimes developed it after a much shorter wait, on the order of a couple of years rather than a decade.

The count of those later cases will not show up on this year’s dashboard. It will show up in pediatric neurology clinics if this cohort is large enough. That is the part of congenital measles that a two-week ICU stay does not settle.

Measles also strips immune memory for a time, a problem researchers call immune amnesia, which leaves a recovered patient open to other infections. A newborn who survives congenital measles still has to get through infancy without the antibodies a vaccinated mother would have provided, and without an MMR dose of their own until the first birthday.

State Clinics Keep Adding MMR Appointments

Demand for vaccine has jumped in the same weeks the congenital cases surfaced. In a typical month, Pennsylvania providers give about 25,000 MMR doses. They gave more than 49,000 in August, and more than 38,000 in the first three weeks of September. State staff have given nearly 5,200 doses at 156 pop-up clinics since the outbreak began in late April, and more than 7,700 doses at state health centers in 2026.

Bogen has urged people to get vaccinated to protect the youngest residents, the group that cannot get the shot yet. Governor Josh Shapiro has tied the deaths to low immunization. Those campaigns can still cut spread around nurseries and obstetric clinics. They cannot rewind an infection that already crossed a placenta.

The six Pennsylvania newborns already counted as congenital cases will not be eligible for MMR until their first birthdays. Until then, their odds still depend on whether the adults in the next room were vaccinated before this outbreak began.

Disclaimer: This article is news reporting on a public-health outbreak and is for information only. It is not medical advice, a diagnosis, or a vaccination recommendation for any person or pregnancy. Readers who are pregnant, planning a pregnancy, or caring for a newborn should talk with an obstetrician, pediatrician, or other qualified clinician about measles exposure, testing, and immunization. Case counts, death classifications, and clinical guidance can change as health departments and CDC update their records.