Rubella (German Measles): Symptoms, Risks in Pregnancy, and Vaccine

What is Rubella (German Measles)?

Rubella, commonly known as German measles or three-day measles, is a contagious viral infection whose principal symptoms include:

• A characteristic red-pink skin rash consisting of small spots
• Swelling of the lymph nodes around the head and neck
• Low-grade fever
• Flu-like symptoms, such as a mild cough and runny nose
• Painful and swollen joints (more common in adults)

The disease is generally mild and resolves without specific treatment within 7 to 10 days. The rubella virus is primarily transmitted by breathing in droplets expelled from the nose or throat of an infected person.

In children, rubella is typically a benign illness with limited risks. However, the situation changes significantly when a pregnant woman contracts the infection. In this case, the virus may cross the placenta and infect the developing fetus, leading to congenital rubella syndrome (CRS). This condition can be devastating, as it is associated with serious birth defects.

Thanks to mandatory childhood vaccination programs implemented in many countries, the incidence of rubella, and especially congenital rubella, has been dramatically reduced worldwide. However, the disease has not been entirely eliminated and continues to pose a risk in unvaccinated populations.

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Transmission

Rubella is a viral infectious disease caused by the Rubella virus, a member of the Togaviridae family. Unlike other Togaviruses, it is not transmitted by insects and infects humans exclusively.

The virus spreads in a manner similar to the common cold or influenza: through respiratory droplets released into the air when an infected person coughs, sneezes, or talks.

Key Transmission Facts:

• An infected individual can spread the disease up to one week before the rash appears and remains contagious for more than 7 days after the rash onset
• Between 25% and 50% of individuals infected with rubella will experience no symptoms at all, yet can still transmit the virus to others
• A pregnant woman infected with rubella can transmit the virus to her fetus through the bloodstream, with potentially severe consequences

Public Health Precautions:

• Anyone with confirmed or suspected rubella should stay home from work or school to prevent spreading the infection.
• Infected individuals must promptly notify friends, family members, and colleagues, particularly pregnant women, of their illness.
• If a child contracts rubella, it is important to inform the school and any childcare providers immediately.

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Symptoms

Incubation Period

The incubation period for rubella is 13 to 24 days, with an average of approximately 18 days. This means it can take 2 to 3 weeks for symptoms to appear after the initial exposure to the virus.

Symptoms in Children

In children, rubella is generally a mild illness with few pronounced symptoms. The hallmark sign is the development of a characteristic skin rash (exanthem):

• The rash typically appears first on the face, then spreads progressively downward to the rest of the body.
• It presents as a pink or red spotted eruption, where individual spots may merge to form uniformly colored patches.
• It may be accompanied by itching.
• It typically lasts up to three days.
• As the rash fades, the affected skin may occasionally peel in small flakes (desquamation).

In most cases, the rash is the first sign of illness noticed by parents or caregivers.

1 to 5 days before the rash, the following prodromal symptoms may occur:

• Mild to moderate fever
• Headache
• Mild eye redness (redness or swelling of the whites of the eyes)
• General malaise and joint pain
• Swollen and enlarged lymph nodes, especially at the back of the neck and behind the ears (a particularly characteristic feature), are common.
• Cough
• Nasal discharge (runny nose)

Symptoms in Adults

In 25–50% of infected adults, no symptoms develop at all. In the remainder, rubella in adults may present with:

• Low-grade fever
• Sore throat
• A rash that spreads from the face to the rest of the body

Some adult patients also report:

• Joint pain and arthritis: up to 70% of adult women with rubella develop some form of arthritis. In contrast, joint symptoms are rare in children and men.
• Red eyes
• General malaise before the skin manifestations appear

In rare cases, rubella can cause more serious complications, including encephalitis (brain infection) and bleeding disorders (thrombocytopenic purpura).

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Duration

Children generally recover relatively quickly, while adults may require more time to fully regain their strength and wellbeing.

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When to Call a Doctor

Contact your doctor immediately if:

• Your child develops a fever of 39°C (102.2°F) or higher. For children under 6 months, call if the fever exceeds 38°C (100.4°F).
• Your child appears significantly unwell, beyond the mild symptoms described above.
• You are pregnant and have been exposed to someone with confirmed or suspected rubella, even if you have no symptoms.
• A suspected rubella rash does not improve within a few days, or is accompanied by unusual or worsening symptoms.
• Your child develops neurological symptoms such as confusion, severe headache, or neck stiffness, which could indicate the rare complication of encephalitis.

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Rubella in Pregnancy

Rubella poses minimal direct risk to healthy children and non-pregnant adults, but represents a serious public health concern when contracted during pregnancy. The congenital rubella syndrome (CRS) is one of the most preventable causes of birth defects worldwide.

Risks to the Fetus

A non-vaccinated pregnant woman who becomes infected with the rubella virus may face:

• Spontaneous miscarriage
• Stillbirth or neonatal death shortly after birth
• Vertical transmission of the virus to the fetus, causing Congenital Rubella Syndrome (CRS)

Manifestations of Congenital Rubella Syndrome

Risk by Gestational Age

The timing of maternal infection is critical in determining the severity of fetal damage:

• First trimester (weeks 1–12): This period carries the highest risk. If infection occurs in the first 8 weeks, the risk of CRS can reach 85%. Major structural malformations are most likely during this time.
• Second trimester (weeks 13–16): Moderate risk. The main concern during this period is sensorineural deafness.
• After 20 weeks of gestation: The risk of significant fetal damage becomes substantially lower.

Key Message: Rubella infection in the first trimester of pregnancy is a medical emergency requiring immediate specialist evaluation.

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Diagnosis

Rubella diagnosis based solely on clinical observation is often unreliable, because the characteristic rash can closely resemble other viral infections. For example, it may look like measles, scarlet fever, or fifth disease (parvovirus B19 infection). Therefore, current protocols mandate specific laboratory tests, which are especially critical for pregnant women or women of childbearing age.

Blood Tests and Serology

The most common diagnostic method is the detection of rubella-specific antibodies in the blood (Rubella serology):

• IgM antibodies: Their presence indicates a recent or active infection. They typically appear within a few days of rash onset and remain detectable for several weeks.

• IgG antibodies: Their presence indicates immunity, either from past infection or vaccination. A significant rise in IgG levels between two blood samples taken two weeks apart confirms an acute infection (seroconversion).

Molecular Testing (PCR)

In selected cases or when rapid, highly sensitive confirmation is required, RT-PCR (reverse transcription polymerase chain reaction) is performed. This test directly detects the genetic material of the rubella virus in biological samples such as:

• Throat or salivary swabs
• Urine samples
• Amniotic fluid (when fetal transmission is suspected)

Diagnosis During Pregnancy

For pregnant women, timely diagnosis is paramount. In addition to standard serology, the clinician may request:

• IgG avidity testing: High avidity indicates that the infection occurred at least 3–4 months before the test, which significantly reduces the likelihood that infection occurred during the current pregnancy. Low avidity suggests a recent primary infection.
• Amniocentesis with PCR: To detect rubella virus in amniotic fluid if fetal infection is suspected.
• Fetal ultrasound: To monitor for structural abnormalities consistent with CRS.

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Treatment

There is currently no specific antiviral treatment that eliminates the rubella virus from the body. The disease almost always follows a benign, self-limiting course in healthy children and adults, resolving spontaneously as the immune system clears the infection.

The main goals of management are: symptom relief, maintaining general wellbeing, and preventing transmission to vulnerable individuals.

Important: Antibiotics are not effective against viral infections and have no role in treating rubella, unless rare secondary bacterial complications (such as otitis media or pneumonia) arise.

Symptom Management

• Fever and pain control: The first-line medication for reducing fever and alleviating joint or muscle pain is paracetamol (acetaminophen). Common example includes Tylenol. Ibuprofen may be used as an alternative in adults and older children.

• Never give aspirin to children or adolescents: Aspirin must never be administered to children or teenagers with viral illnesses. The reason is the risk of Reye’s syndrome, a rare but life-threatening condition. This syndrome can lead to liver failure and severe brain damage.

• Rest and isolation: Bed rest is recommended during the acute febrile phase. Home isolation should be maintained for at least 7 days from the onset of the rash to protect non-immune individuals. Special care should be taken around pregnant women and immunocompromised individuals.

Lifestyle and Home Support

While no specific diet is required, appropriate home management helps speed recovery:

• Hydration: Drinking plenty of fluids, such as water, diluted fruit juices, or broths, is essential to prevent dehydration associated with fever. This is especially important for young children.

• Environmental humidification: If cough or nasal discharge is present, maintaining adequate air humidity can help soothe the respiratory tract and ease breathing.

• Comfortable environment: Keep the room at a comfortable temperature, and use light clothing and bedding to help regulate body temperature during fever.

Management of Rubella in Pregnancy

If a pregnant woman contracts rubella, the situation requires immediate specialist management involving an obstetrician and an infectious disease specialist. Steps include:

• Confirmation of diagnosis through serological and molecular testing.
• Assessment of gestational age at the time of infection to estimate risk to the fetus.
• In selected cases, administration of hyperimmune immunoglobulins may be considered. However, their efficacy in preventing fetal transmission is not guaranteed, and their use requires careful case-by-case clinical evaluation.
• Fetal monitoring through advanced morphological ultrasound at regular intervals.
• Amniocentesis (if indicated) to assess fetal infection.
• In cases of confirmed early-pregnancy infection with high risk of CRS, counseling regarding pregnancy options may be offered, in accordance with applicable national legislation and the wishes of the patient.

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Vaccine

Rubella can be effectively prevented through vaccination. Widespread immunization is the cornerstone of the global strategy to eliminate congenital rubella syndrome.

The MMR Vaccine

Rubella is prevented through the MMR vaccine (Measles, Mumps, and Rubella), administered as part of the standard childhood immunization schedule in most countries:

• First dose of MMR: develops immunity to measles and rubella in 90–95% of recipients
• Second dose: ensures immunity in those who did not respond to the first dose; after two doses, protection is approximately 97–99%

A small residual number of individuals may remain unprotected despite full vaccination, though this is exceedingly rare.

Important Vaccination Points

• A vaccinated person does not transmit the vaccine virus, even if a mild rash develops as a temporary side effect. No special precautions are necessary; the child can attend school normally.

• The MMR vaccine must not be administered during pregnancy, nor to women who may become pregnant within one month of vaccination, as the vaccine contains a live attenuated virus.

• If you are planning a pregnancy, ensure you are immune to rubella by having a blood test to check your immunity status. If you are not immune, get vaccinated at least one month before trying to conceive.

• Women who are found to be non-immune during pregnancy should be vaccinated immediately after delivery (postpartum vaccination), before leaving the hospital.

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Return to School

Children with rubella may return to school or daycare 7 days after the rash first appeared.

According to the UK National Health Service (NHS), rubella is infectious from approximately 1 week before symptoms begin until 4 days after the rash appears. However, out of an abundance of caution, most health authorities recommend a full 7-day exclusion period from rash onset to ensure the child is no longer contagious before returning to shared environments.

Note for parents: Always follow the specific guidelines issued by your local or national health authority, as exclusion periods may vary slightly by country.

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Sources and Bibliography

• CDC - Centers for Disease Control and Prevention: Rubella
• WHO - World Health Organization: Rubella Fact Sheet
• NHS UK - Rubella (German Measles)
• Reef SE, Plotkin SA. Rubella vaccines. In: Plotkin SA, Orenstein WA, Offit PA, Edwards KM (eds). Vaccines. 7th ed. Elsevier; 2018.
• Bouthry E, Picone O, Hamdi G, et al. Rubella and pregnancy: diagnosis, management and outcomes. Prenatal Diagnosis. 2014;34(13):1246-1253.
• Lambert N, Strebel P, Orenstein W, et al. Rubella. Lancet. 2015;385(9984):2297-2307.
• Duszak RS. Congenital rubella syndrome - major review. Optometry. 2009;80(1):36-43.