Pennsylvania Warns of Measles Risks During Pregnancy

Pennsylvania health officials are warning about measles infections during pregnancy and the possibility of congenital or perinatal measles affecting newborns. Recent reports have renewed attention on the risks measles can pose to pregnant people, fetuses, and infants who are too young for routine vaccination. NBC News

Measles is among the most contagious infectious diseases. It spreads through the air when an infected person breathes, coughs, or sneezes. During pregnancy, measles can cause serious illness and may be associated with pregnancy loss, premature delivery, low birth weight, or infection in the newborn.

Congenital measles is uncommon. The term generally describes measles infection affecting a baby before birth or around the time of delivery. It is different from congenital rubella syndrome, which is caused by the rubella virus.

Anyone who is pregnant and may have been exposed to measles should promptly contact an obstetrician, midwife, healthcare professional, or local health department. Call before visiting a clinic or emergency department so staff can reduce the risk of exposing other patients.

Medical disclaimer: This article provides general health information and does not replace advice from an obstetrician, midwife, pediatrician, infectious-disease specialist, or public health department.

What Pennsylvania Officials Are Warning About

Recent reports describe renewed concern among Pennsylvania health officials about measles infections during pregnancy and possible congenital measles. The available reports do not establish the exact number of congenital measles cases, the number of pregnant people infected, the counties involved, or whether every reported case was laboratory-confirmed. Outbreak counts can change as investigations continue.

Readers should verify current figures with the Pennsylvania Department of Health. Reports of measles-related deaths or school exposures do not establish that pregnancy or congenital infection was involved. Those are separate issues requiring specific medical and public health confirmation.

Measles can remain infectious in an indoor area for up to two hours after an infected person has left, according to the Centers for Disease Control and Prevention (CDC).

What Is Congenital Measles?

Congenital measles refers to measles infection affecting a baby before birth or around delivery. It may occur when a pregnant person develops measles during pregnancy or when infection occurs close enough to delivery for the newborn to be exposed before developing protection.

Related terms include:

• Congenital measles
• Perinatal measles
• Neonatal measles
• Measles infection in a newborn

The timing of maternal infection is important. A person who develops measles shortly before delivery may not transfer enough protective antibodies to the infant. The newborn may also be exposed during or soon after birth.

Congenital measles is different from congenital rubella syndrome. Rubella infection during pregnancy can cause serious birth defects, but rubella and measles are different viruses with different testing, complications, and prevention strategies.

How Measles Can Affect Pregnancy

Measles during pregnancy can cause serious illness in the pregnant person. Possible complications include:

• Pneumonia
• Dehydration
• Hospitalization
• Pregnancy loss
• Preterm birth
• Low birth weight

Potential concerns for the fetus or newborn include premature delivery, low birth weight, fetal loss, measles infection, and the need for specialized monitoring or hospital care. Risk depends on the timing and severity of infection, the pregnant person’s immunity and overall health, and the infant’s condition.

The CDC identifies pregnancy as a condition that can increase the risk of severe measles complications. Exposure does not automatically mean infection, and confirmed infection does not guarantee fetal or newborn complications.

Symptoms of Measles During Pregnancy

Early symptoms commonly include:

• Fever
• Cough
• Runny nose
• Red or watery eyes
• Fatigue
• General discomfort

A flat, red rash often begins on the face or along the hairline and spreads downward to the neck, trunk, arms, and legs. A person may spread measles before recognizing the rash.

Fever and rash can result from many conditions, so a rash alone does not confirm measles. Anyone with a possible exposure, fever, or rash should contact a healthcare professional immediately and call before going to a medical facility.

Seek urgent medical care for trouble breathing, chest pain, confusion, severe dehydration, persistent or severe fever, fainting, extreme weakness, reduced fetal movement later in pregnancy, signs of labor, vaginal bleeding, fluid leakage, or severe abdominal pain. Tell emergency responders about the possible measles exposure.

What to Do After Possible Exposure

Contact an obstetrician, midwife, pediatrician, infectious-disease clinician, or local health department before visiting a healthcare facility. Provide the following information:

• Date and location of exposure
• Whether the exposure occurred indoors
• Travel history
• Vaccination history
• Current symptoms
• Stage of pregnancy
• Information about other exposed household members

Do not enter a clinic waiting room without calling first. Staff may arrange a separate entrance, appointment time, testing process, or isolation procedure.

Healthcare professionals may review vaccination records, previous laboratory evidence of immunity, and medical history. Public health officials may determine whether post-exposure prophylaxis is appropriate. The decision can depend on pregnancy status, time since exposure, age, health conditions, evidence of immunity, and whether symptoms have developed. Do not self-treat after an exposure.

Measles Vaccination and Pregnancy

The measles, mumps, and rubella (MMR) vaccine is the primary way to prevent measles. High vaccination coverage also helps protect people who cannot be vaccinated, including some pregnant people and young infants.

People planning pregnancy should review their vaccination history before conception. The CDC recommends discussing measles immunity with a healthcare professional when vaccination records are incomplete or uncertain.

MMR is a live attenuated vaccine and is generally not administered during pregnancy. Vaccination decisions should be discussed with a clinician. People who need MMR vaccination may be advised to receive it after delivery. Breastfeeding is not a reason to avoid MMR vaccination.

Accidental MMR vaccination during pregnancy is not a reason to end a pregnancy. Contact an obstetrician for individualized advice and follow-up.

Protecting Newborns and Vulnerable Household Members

Families can reduce risk by:

• Keeping eligible household members up to date on recommended vaccines
• Avoiding contact with people who may have measles
• Following isolation instructions
• Reviewing vaccination records before international travel
• Monitoring public health notices
• Following guidance about crowded settings during an active exposure investigation

A clinician may monitor a newborn more closely if the mother had confirmed measles during pregnancy, exposure occurred near delivery, the infant shared space with a potentially infected person, maternal immunity is uncertain, or the newborn develops symptoms.

Possible symptoms in a newborn include fever, rash, cough, runny nose, red or irritated eyes, poor feeding, unusual sleepiness, and breathing difficulty. Call the pediatrician or healthcare facility before arrival if measles is suspected.

How Measles Spreads in Pennsylvania Communities

Measles spreads through the air and can remain infectious for a period after an infected person leaves. People without immunity can become infected after spending time in the same indoor space as an infected person, even before the infected person develops a rash.

Schools and childcare centers may become focal points during investigations because children spend extended periods together indoors. Public health teams may identify exposed students, staff members, and families and provide instructions about monitoring, testing, vaccination, or exclusion from group settings.

Measles can enter communities through international or domestic travel. Families traveling outside the United States should discuss measles vaccination with a healthcare professional well in advance. Travel recommendations vary by age, destination, and medical history.

When to Contact Pennsylvania Health Authorities

Contact the Pennsylvania Department of Health or a local health department about:

• Confirmed or suspected measles exposure
• Isolation questions
• Vaccination records
• Immunity assessment
• Outbreak updates
• School or childcare exposure
• Household contact recommendations
• Possible infection during pregnancy

Health departments can assist with exposure assessments, contact tracing, and public health instructions. Pennsylvania residents should check the Pennsylvania Department of Health for current case counts, county notices, and recommendations.

Key Takeaways

• Measles during pregnancy can create serious risks for the pregnant person and baby.
• Congenital or perinatal measles is rare but requires coordinated medical and public health management.
• Congenital measles differs from congenital rubella syndrome.
• Exposure does not automatically mean infection or fetal complications.
• People with possible exposure should call a healthcare professional before visiting in person.
• MMR vaccination remains the primary prevention method, but pregnancy-specific decisions require clinical guidance.
• Current Pennsylvania outbreak information should come from state and local health authorities.