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STDs and Pregnancy
From: National Center for HIV, STD and TB Prevention
    
Division of Sexually Transmitted Diseases

Women who are pregnant can become infected with the same sexually transmitted diseases (STDs) as women who are not pregnant.   Pregnancy does not provide women or their babies any protection against STDs.   In fact, the consequences of an STD can be significantly more serious--even life threatening--for a woman and her baby if the woman becomes infected with an STD while she is pregnant.  As the list of diseases known to be sexually transmitted continues to grow, it is increasingly important that women be aware of the harmful effects of these diseases and know how to protect themselves and their children against infection.

How can STDs affect a woman during pregnancy?
STDs can have many of the same consequences for pregnant women as for women who are not pregnant.  STDs can cause cervical and other cancers, chronic hepatitis, cirrhosis, and other complications.  Many STDs are silent--or present without symptoms--in women. 
Among the additional consequences pregnant women may suffer from STDs are early onset of labor, premature rupture of the membranes surrounding the baby in the uterus, and uterine infection after delivery.

How can a pregnant woman’s baby become infected?
STDs can be transmitted from a pregnant woman to the fetus, newborn, or infant before, during, or after birth.  Some STDs (like syphilis) cross the placenta and infect the fetus during its development. Other STDs (like gonorrhea, chlamydia, hepatitis B, and genital herpes) are transmitted from the mother to the infant as the infant passes through the birth canal.  HIV infection can cross the placenta during pregnancy, infect the newborn during the birth process, and, unlike other STDs, infect an infant as a result of breast-feeding.

How can STD’s affect the fetus or newborn?
Harmful effects on the baby may include stillbirth, low birth weight, conjunctivitis (eye infection), pneumonia, neonatal sepsis (infection in the blood stream), neurologic damage (such as brain damage or motor disorder), congenital abnormalities (including blindness, deafness, or other organ damage), acute hepatitis, meningitis, chronic liver disease, and cirrhosis.  Some of these consequences may be apparent at birth; others may not be detected until months or even years later.

How common are STDs among pregnant women in the U.S.?
Some STDs, such as genital herpes and bacterial vaginosis, are quite common among pregnant women in this country.  Other STDs, notably HIV and syphilis, are much less common in pregnant women.  The table below shows the estimated number of pregnant women in the U.S., per year with specific STDs.
 

STDs 

Estimated Number of Pregnant Women

Bacterial vaginosis

800,000

Herpes simplex 

800,000 

Chlamydia

200,000

Trichomoniasis

80,000

Gonorrhea

40,000

Hepatitis B

40,000

HIV 

8,000

Syphilis

8,000

(Source: Goldenberg et al., 1997)

Should pregnant women be tested for STDs?
STDs affect women of every socioeconomic and educational level, age, race, ethnicity, and religion.  The CDC STD Treatment Guidelines (1997) recommend that pregnant women be screened for the following STDs:

Pregnant women should request these tests specifically because some doctors do not routinely perform them.  New and increasingly accurate tests continue to become available.  Even if a woman has been tested in the past, she should be tested again when she becomes pregnant.

Can STDs be treated during pregnancy?
Bacterial STDs (like chlamydia, gonorrhea, and syphilis) can be treated and cured with antibiotics during pregnancy.  There is no cure for viral STDs such as genital herpes and HIV, but antiviral medication for herpes and HIV may reduce symptoms in the pregnant woman.  In addition, the risk of passing HIV infection from mother to baby is dramatically reduced by treatment.  For women who have active genital herpes lesions at the time of delivery, a cesarean section may be performed to protect the newborn against infection.

How can pregnant women protect themselves against infection?
Although a woman may be monogamous during her pregnancy, she can remain at risk of STDs if her partner is not monogamous.  For this reason, she may want to consider consistent and correct use of latex condoms for every act of intercourse.  Protection is critical throughout a woman’s pregnancy, including the last trimester when active infection can present a great threat to the health of a woman and her baby.

Where can I get more information?
STD Hotline 1-800-227-8922
HIV Hotline 1-800-342-AIDS