SOGC CLINICAL PRACTICE GUIDELINES
Rubella in Pregnancy
Abstract
Objective: To provide an update on rubella and pregnancy so that
health professionals remain aware of the potentially devastating
effects on the developing fetus.
Outcomes: Rubella vaccination has been effective in virtually
eliminating congenital rubella syndrome in Canada.
Evidence: Medline, PubMed, and Cochrane Database were
searched for articles published between 1985 and 2007.
Values: The quality of evidence was rated using the criteria
described in the report of the Canadian Task Force on Preventive
Health Care.
Sponsor: The Society of Obstetricians and Gynaecologists of
Canada.
J Obstet Gynaecol Can 2008;30(2):152–158
Recommendations
1. Since the effects of congenital rubella syndrome vary with the
gestational age at the time of infection, accurate gestational dating
should be established, as it is critical to counselling. (II-3A)
2. The diagnosis of primary maternal infection should be made by
serological testing. (II-2A)
3. In a pregnant woman who is exposed to rubella or who develops
signs or symptoms of rubella, serological testing should be
performed to determine immune status and risk of congenital
rubella syndrome (III-A)
4. Rubella immunization should not be administered in pregnancy but
may be safely given post partum. (III-B)
5. Women who have been inadvertently vaccinated in early
pregnancy or who become pregnant immediately following
vaccination can be reassured that there have been no cases of
congenital rubella syndrome documented in theses situations. (III-B)
6. Women wishing to conceive should be counselled and encouraged
to have their antibody status determined and undergo rubella
vaccination if needed. (I-A)
INTRODUCTION
R
ubella, also called German measles, is a disease of child-
hood that has markedly declined in incidence in North
America since the introduction of routine childhood rubella
vaccination. In the absence of pregnancy, it is usually clini-
cally manifested as a mild self-limited infection.
1
During
pregnancy, however, the virus can have potentially devas-
tating effects on the developing fetus. It has been directly
responsible for inestimable wastage and for severe congeni-
tal malformations.
1
This document will review some of the
implications of rubella during pregnancy. Recommenda-
tions are evaluated using the evidence criteria of the
Canadian Task Force on Preventive Health Care (Table 1).
2
EPIDEMIOLOGY
The rubella vaccination program introduced in 1969 has
been very effective.
3
Rubella and the CRS have largely been
eliminated in Canada.
4
However, cases of CRS continue to
occur in Canada and other parts of the world, thus CRS
remains a concern.
5
152
l FEBRUARY JOGC FÉVRIER 2008
SOGC CLINICAL PRACTICE GUIDELINES
This guideline was prepared and reviewed by the Clinical Practice
Obstetrics Committee, reviewed by the Infectious Disease
Committee, and approved by Executive and Council of the Society
of Obstetricians and Gynaecologists of Canada.
PRINCIPAL AUTHORS
Lorraine Dontigny, MD, FRCSC, Montréal (Québec)
Marc-Yvon Arsenault, MD, MSc, FRCSC, Montréal (Québec)
Marie-Jocelyne Martel MD, FRCSC, Saskatoon SK
CLINICAL PRACTICE OBSTETRICS COMMITTEE
Anne Biringer, MD, CCFP, FCFP, Toronto ON
Johanne Cormier, RN, Lasalle QC
Martina Delaney, MD, FRCSC, St. John’s NL
Tom Gleason, MD, FRCSC, Edmonton AB
Dean Leduc, MD, CCFP, Orleans ON
Marie-Jocelyne Martel, MD, FRCSC, (Chair) Saskatoon SK
Debbie Penava, MD, FRCSC, London ON
Joshua Polsky, MD, FRCSC, Windsor ON
Anne Roggensack, MD, FRCSC, Toronto ON
Carol Rowntree, MD, CCFP, Sundre AB
Ann Kathleen Wilson, BHSc, RM, Ilderton ON
This clinical practice guideline reflects emerging clinical and scientific advances as of the date issued and is subject to change. The
information should not be construed as dictating an exclusive course of treatment or procedure to be followed. Local institutions can
dictate amendments to these opinions. They should be well documented if modified at the local level. None of these contents may be
reproduced in any form without prior written permission of the SOGC.
Key Words: Rubella, congenital rubella syndrome, pregnancy,
immunization
No. 203, February 2008
In Canada, before the introduction of rubella vaccine in
1969, rubella epidemics occurred at irregular three- to
ten-year intervals. After 1970, the incidence of rubella
declined markedly and has stayed at a mean endemic rate of
4/100 000 population per year. This is an average of 1000
cases reported/year, range 237 to 2450.
5
Rubella virus con-
tinues to circulate in the community, and not all pregnant
women are immune. Some segments of the population are
not immunized against rubella because they are missed,
refuse immunization, or come from countries where rubella
vaccination is not part of the routine immunization program.
5
Large rubella outbreaks occurred in Canada in the 1990s.
The outbreaks were a reflection of Canadian immigration
policies in the 1970s and 1980s, and current international
immunization policies.
5
In 2005, 220 cases of rubella were
confirmed in three counties in Ontario. The majority of
these cases were in members of a religious community in
which many members had not been vaccinated or had not
accepted the full range of vaccines routinely recom-
mended.
6
This is a reminder that rubella is not only a disease
of unimmunized immigrants. Epidemics do occur in
Canada, and pregnant women born in Canada may be at risk
of infection.
CLINICAL MANIFESTATIONS
In a non-pregnant woman, rubella is usually an infection of
minor impact characterized by a mild, self-limited disease
associated with a characteristic rash.
1,6
The incubation
period for rubella is 12 to 23 days. The infectious period is
from 7 days before to 5–7 days after rash onset.
1
Although
rubella is asymptomatic in 25% to 50% of cases, some indi-
viduals may experience mild prodromal symptoms such as
low-grade fever, conjunctivitis, sore throat, coryza, head-
aches or malaise, and tender lymphadenopathy. These
prodromal symptoms will usually last one to five days
before the onset of the scarletiniform rash, which may be
mildly pruritic.
4
The rash characteristically begins on the
face and spreads to the trunk and extremities. It will usually
resolve within three days in the same order in which it
appeared (face first and then body).
7
Polyarthritis and polyarthralgia are potential sequelae,
developing mostly in adolescent and adult women
(60–70%) about one week after the rash.
8
Classically, the
hands, knees, wrists, and ankles are affected symmetrically,
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Table 1. Key to evidence statements and grading of recommendations, using the ranking of the
Canadian Task Force on Preventive Health Care
Quality of Evidence Assessment*
Classification of Recommendations†
I:
Evidence obtained from at least one properly randomized
controlled trial
II-1: Evidence from well-designed controlled trials without
randomization
II-2: Evidence from well-designed cohort (prospective or
retrospective) or case-control studies, preferably from more
than one centre or research group
II-3: Evidence obtained from comparisons between times or
places with or without the intervention. Dramatic results in
uncontrolled experiments (such as the results of treatment
with penicillin in the 1940s) could also be included in this
category
III: Opinions of respected authorities, based on clinical
experience, descriptive studies, or reports of expert
committees
A. There is good evidence to recommend the clinical preventive
action
B. There is fair evidence to recommend the clinical preventive
action
C. The existing evidence is conflicting and does not allow to
make a recommendation for or against use of the clinical
preventive action; however, other factors may influence
decision-making
D. There is fair evidence to recommend against the clinical
preventive action
E. There is good evidence to recommend against the clinical
preventive action
I.
There is insufficient evidence (in quantity or quality) to make
a recommendation; however, other factors may influence
decision-making
*The quality of evidence reported in these guidelines has been adapted from The Evaluation of Evidence criteria described in the Canadian Task Force
on Preventive Health Care.
2
†Recommendations included in these guidelines have been adapted from the Classification of Recommendations criteria described in the The Canadian
Task Force on Preventive Health Care.
2
ABBREVIATIONS
CI
confidence interval
CRS
congenital rubella syndrome
CVS
chorionic villus sampling
ELISA
enzyme linked immunoassay
FGR
fetal growth restriction
IgG
immunoglobulin G
IgM
immunoglobulin M
MMR
measles, mumps, rubella
PCR
polymerase chain reaction
and the pain will last about one to four weeks . Chronic
arthritis rarely develops. Other manifestations, although
rare, include tenosynovitis, carpal tunnel syndrome,
thrombocytopenia, post-infectious
encephalitis,
myo-
carditis, hepatitis, hemolytic anemia, and hemolytic uremic
syndrome.
9,10
CONGENITAL RUBELLA SYNDROME
CRS represents the neonatal manifestations of antenatal
infection with the rubella virus. The infection affects many
fetal systems.
1,11,12
The risk of CRS abnormalities varies
according to the gestational age at which the maternal infec-
tion occurs.
7
Therefore, counselling regarding the risk to
the fetus and management of pregnant women must be
individualized. Transplacental vertical infection by the
rubella virus can have catastrophic effects on the develop-
ing fetus, resulting in spontaneous abortion, fetal infection,
stillbirth, or fetal growth restriction.
13
Many children born
with CRS will demonstrate persistent neuromotor deficits
later in life. Pneumonitis, diabetes mellitus, thyroid
dysfunctions, and progressive panencephalitis are other late
expressions of CRS.
14,15
The most common congenital defects and late manifesta-
tions are shown in Table 2.
12,14,15
VERTICAL TRANSMISSION AND RISK OF CRS
Fetal infection is acquired hematogenously, and the rate of
transmission varies with the gestational age at which mater-
nal infection occurs. After infecting the placenta, the rubella
virus spreads through the vascular system of the developing
fetus, causing cytopathic damage to blood vessels and
ischemia in developing organs.
16
When maternal infection/exposure occurs in the first tri-
mester, fetal infection rates are near 80%, dropping to 25%
in the late second trimester and increasing again in the third
trimester from 35% at 27–30 weeks’ gestation to nearly
100% beyond 36 weeks’ gestation.
7
The risk of congenital
defects has been reported to be 90% when maternal infec-
tion occurs before 11 weeks of gestation, 33% at 11–12
weeks, 11% at 13–14 weeks, 24% at 15–16 weeks, and 0%
after 16 weeks.
7
Therefore, the risk of congenital defects after maternal
infection is essentially limited to the first 16 weeks of gesta-
tion. Little, if any, risk of CRS is associated with infection
beyond 20 weeks, and FGR seems to be the only sequela of
third trimester infection.
7–17
Periconceptual maternal infec-
tion does not seem to increase the risk of CRS.
18
Maternal immunity, either after vaccination or naturally
derived, is generally protective against intrauterine rubella
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Table 2. Congenital defects and late manifestations of rubella infection
Present at birth
Late manifestations
Audiologic anomalies (60–75%)
Sensorineural deafness
Cardiac defects (10–20%)
Pulmonary stenosis
Patent ductus arteriosus
Ventricular septal defect
Diabetes mellitus
Thyroiditis
Growth hormone deficit
Behavioural disorder
Ophthalmic defects (10–25%)
Retinopathy
Cataracts
Microphthalmia
Pigmentary and congenital glaucoma
Central nervous system (10–25%)
Mental retardation
Microcephaly
Meningoencephalitis
Others
Thrombocytopenia
Hepatosplenomegaly
Radiolucent bone disease
Characteristic purpura (Blueberry muffin appearance)
infection.
19,20
However, there have been cases of CRS after
maternal reinfection.
20
Therefore, CRS should always be
considered in a fetus or neonate with a clinical picture sug-
gestive of congenital infection.
19
It should be noted that no
case of CRS has been reported when maternal reinfection
occurred after 12 weeks of pregnancy.
21
Recommendation
1. Since the effects of congenital rubella syndrome vary with
the gestational age at the time of infection, accurate ges-
tational dating should be established, as it is critical to
counselling. (II-3A)
DIAGNOSIS OF RUBELLA INFECTION
Diagnosis of Maternal Infection
Accurate diagnosis of acute primary rubella infection in
pregnancy is imperative and requires serologic testing, since
an important number of cases are subclinical. Serology by
ELISA to measure rubella-specific IgG and IgM is conve-
nient, sensitive, and accurate. The presence of a rubella
infection is diagnosed by:
•
A fourfold rise in rubella IgG antibody titre between
acute and convalescent serum specimens
•
A positive serologic test for rubella-specific IgM
antibody
•
A positive rubella culture (isolation of rubella virus in a
clinical specimen from the patient).
1
Serologic studies are best performed within 7 to 10 days
after the onset of the rash and should be repeated two to
three weeks later. Viral cultures drawn from nasal, blood,
throat, urine, or cerebrospinal fluid maybe positive from
one week before to two weeks after the onset of the rash.
1,22
Recommendation
2. The diagnosis of primary maternal infection should be
made by serological testing. (II-2A)
Diagnosis of Fetal Infection
There are small series reporting the usefulness of
rubella-specific PCR on CVS for the prenatal diagnosis of
intrauterine rubella infection.
23,24
This technique has proved
to be superior to assessment of amniotic fluid samples in
one study.
25
Because CVS is done at 10 to 12 weeks of gesta-
tion, it allows earlier detection than is possible with other
samples, such as amniotic fluid taken at 14 to 16 weeks or
fetal blood obtained at 18 to 20 weeks of pregnancy.
Ultrasound diagnosis of CRS is extremely difficult. Biomet-
ric data can aid in the diagnosis of FGR but are not a good
tool for diagnosing CRS, given the nature of the malforma-
tions encountered. Any fetus presenting with FGR should
be evaluated for congenital viral infections, including
rubella.
9
MANAGEMENT OF RUBELLA EXPOSURE/
INFECTION IN PREGNANT WOMEN
The management of the exposed pregnant woman must be
individualized and depends when during gestation she was
exposed and on her state of immunity. Confirmation of
acute rubella infection in pregnant women is often difficult.
Clinical diagnosis is unreliable because a large proportion of
cases are subclinical and because clinical features can be
very similar to those of other illnesses. The Figure shows a
guide for the management of the exposed pregnant woman
or woman presenting with rubella-like symptoms in
pregnancy.
If a pregnant woman develops signs or symptoms of a
rubella-like illness or has recently been exposed to rubella,
gestational age should be determined as well as her state of
immunity.
1. Known immune
³ 12 weeks of gestation.
a. No further testing is necessary. CRS has not been
reported after maternal reinfection beyond 12 weeks’
gestation.
19
2. Known immune
£ 12 weeks of gestation.
a. If these women demonstrate a significant rise in
rubella IgG antibody titre without detection of IgM
antibody, they should be informed that reinfection is
likely to have occurred.
20
Fetal risk for congenital
infection after maternal reinfection during the first
trimester has been estimated at 8% (95% CI
2–22%).
19
Appropriate counselling should be
provided.
3. Non-immune or immunity unknown.
a. Gestational age
£ 16 weeks.
i. Acute and convalescent IgG and IgM should be
obtained. (The diagnosis of recent rubella
infection should include serologic testing of acute
sera for both IgG and IgM antibody.) Acute
infection is diagnosed when IgM antibodies are
positive. When IgM antibodies are negative or
unavailable, testing of paired acute and
convalescent sera for IgG antibody should be
performed. During a rubella-like illness, the acute
specimen should be drawn as soon as possible,
followed by a convalescent specimen two to three
weeks later if the first IgM specimen was negative.
When there is a suspected exposure, the acute
specimen should be drawn immediately, followed
by a convalescent specimen 4 to 5 weeks later.
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b. Gestational age between 16 and 20 weeks.
i. Instances of CRS between 16 and 20 weeks’
gestation are rare (< 1%) and may be manifested
by sensorineural deafness (often severe) in the
newborn. Appropriate counselling to the
non-immune pregnant woman should be
provided.
c. Gestational age
> 20 weeks.
i. A pregnant woman exposed to rubella or
presenting with rubella-like illness after
20 weeks of gestation should be reassured, since
no studies have documented CRS after
20 weeks.
9,13,14,18
d. Diagnostic difficulty–late presentation with
unknown immune status.
i. A pregnant woman presenting 5 weeks or more
after exposure to a rash illness or 4 weeks or more
after onset of a rash presents a diagnostic
dilemma. If IgG antibodies are negative, the
patient is clearly susceptible to rubella and has no
evidence of a recent infection. If IgG are positive,
there is evidence of a previous infection. It is then
difficult to determine the date of infection and the
risk to the fetus, although a low level of antibody
suggests more remote infection. Testing for IgM
antibody or repeating the test for IgG antibody
levels to determine whether there is a significant
rise or decline may be considered.
Recommendation
3. In a pregnant woman who is exposed to rubella or who
develops signs or symptoms of rubella, serological test-
ing should be performed to determine immune status
and risk of congenital rubella syndrome. (III-A)
TREATMENT
The treatment of acute rubella infection is supportive. The
prognosis is generally excellent for pregnant women with
rubella infection.
There are no data supporting the use of immunoglobulin in
pregnant women with acute infection in order to diminish
the fetal response to disease. The Centers for Disease Con-
trol recommend limiting its use to women with known
rubella exposure who decline pregnancy termination.
26
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Management of exposed pregnant women
Adapted from ACOG Education and Technical Bulletins 2002
THE VACCINE
The first live attenuated rubella vaccine was introduced in
1969. A single dose of this vaccine will result in measurable
antibody in almost 95% of susceptible persons. Antibody
levels persist for at least 18 years in more than 90% of the
vaccine recipients.
5
Primary failure of the rubella vaccine
occurs in less than 5% of immunizations.
27
Although rein-
fection may occur in immunized pregnant women, these
reinfections have resulted in only 8% risk of CRS in the first
trimester of pregnancy.
19
The rubella vaccine is usually well tolerated. Side effects to
vaccination, although rare, include arthritis, arthralgia, rash,
adenopathy, and fever.
27
The actual vaccine-related fre-
quency of acute arthritis or arthralgia in non-immune
women is in the order of 5% each. However, there is no evi-
dence of any increased risk of new onset chronic
arthropathies or neurological conditions in women receiv-
ing the RA27/3 rubella vaccine. There are no epidemiologic
data supporting an association of CRS or autism to the
MMR vaccine.
28
Contraindications to rubella vaccinations include febrile ill-
ness, immunodeficiency, history of an anaphylactic reaction
to neomycin, and pregnancy.
1
Rubella vaccine virus has the
potential to cross the placenta and infect the fetus.
1
How-
ever, there has been no report of CRS in the offspring of
women inadvertently vaccinated during early preg-
nancy.
29,30
Therefore, pregnancy termination is not recom-
mended for these patients.
31
Given the potential risks to the
fetus, women are advised not to become pregnant for a
period of 28 days after immunization.
32
The vaccine can be given safely to postpartum women who
are breastfeeding and to the children of pregnant women,
since infection is not transmitted from recently immunized
individuals. Breastfeeding is NOT contraindicated.
5
The
vaccine can be administered in conjunction with other
immune globulin preparations such as Rh-immune globulin.
7
Recommendations
4. Rubella immunization should not be administered in
pregnancy but may be safely given post partum. (III-B)
5. Women who have been inadvertently vaccinated in early
pregnancy or who become pregnant immediately follow-
ing vaccination can be reassured that there have been no
cases of congenital rubella syndrome documented in the-
ses situations. (III-B)
PREVENTION
The best therapy for CRS is prevention. All girls should be
vaccinated against rubella before entering the child-bearing
years.
To prevent CRS, the following steps are recommended.
1. Providing universal infant immunization to decrease
circulation of virus (instituted in all provinces in 1983).
2. Using measles, mumps, and rubella or measles-rubella
vaccine as the immunizing agent in catch-up
campaigns and as the second dose in the new
two-dose routine immunization program for measles.
(This may expedite the elimination of rubella).
3. Ensuring that girls are immune before they reach
child-bearing age and using every opportunity to asses
the immunity of women of child-bearing age and
providing vaccination if necessary (pre-conceptual and
infertility consultations).
4. Screening to determine the antibody status of all
pregnant women to determine susceptibility.
5. Providing programs to ensure postpartum
immunization of non-immune women before they are
discharged from the hospital.
6. Screening for immunity and vaccination, if necessary,
of all health care personnel, including students in
training.
7. Immunizing all immigrant and refugee women at their
first encounter with the Canadian health care system,
unless they have documentation of effective
vaccination or natural immunity.
Recommendation
6. Women wishing to conceive should be counselled and
encouraged to have their antibody status determined and
undergo rubella vaccination if needed. (I-A)
CONCLUSION
Rubella infection of a pregnant woman may have devastat-
ing effects on the developing fetus. The mainstay of preven-
tion is the universal immunization of all Canadian infants
and identification and immunization of immigrant women
at risk. The diagnosis of infection should be made as soon
as possible. Contact with rubella should be avoided
throughout the first two trimesters of pregnancy, even in
IgG-positive pregnant women. Women should be coun-
selled about the possible risk of vertical transmission and
offered pregnancy termination, especially if primary infec-
tion occurs prior to 16 weeks’ gestation. Unfortunately,
there is no in utero treatment available for infected fetuses.
Thus, prevention remains the best strategy to eliminate all
cases of CRS.
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