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DESCRIPTION
Group B streptococcus (GBS) is a type of bacteria that causes illness in newborn babies, pregnant women, the elderly, and adults with other illnesses, such as diabetes or cancer. GBS is the most common cause of life-threatening infections in newborns.
How common is GBS disease?
GBS is the most common cause of sepsis (blood infection) and meningitis (infection of the fluid and lining surrounding the brain) in newborns. GBS causes newborn pneumonia and is more common than other, better known, newborn problems such as rubella, congenital syphilis, and spina bifida. Approximately 8,000 babies in the United States get GBS disease each year and about 300 of these babies die. The statistical chances of your baby having a fatal infection are approximately one out of 13,333 births. This is slightly less than the rate for maternal mortality associated with vaginal birth (which is one out of 16,666). However, babies that survive a serious infection with GBS, particularly those who have meningitis, may have long-term problems , such as hearing or vision loss or learning disabilities.
In pregnant women, GBS can cause urinary tract infections, womb infections (amnionitis, endometritis), and stillbirth. Among men and among women who are not pregnant, the most common diseases caused by GBS are blood infections, skin or soft tissue infections, and pneumonia. Approximately 20 percent of men and non-pregnant women with GBS disease die of the disease.
Does everyone who has GBS get sick?
Many people carry GBS in their bodies but do not become ill. These people are considered to be "colonized." Adults can be colonized in the bowel, genital tract, urinary tract, throat, or respiratory tract. Fifteen percent to 40 percent of pregnant women are colonized with GBS in the rectum or vagina. A fetus may become colonized with GBS on the skin if the mother is colonized with GBS in the rectum or vagina; colonization occurs before or during birth.
How does GBS disease affect newborns?
Approximately 1-2 percent of babies who are colonized with GBS develop signs and symptoms of GBS disease. Three-fourths of the cases of GBS disease among newborns occur in the first week of life ("early-onset disease"), and most of these cases are apparent a few hours after birth. Sepsis, pneumonia, and meningitis are the most common problems. Premature babies are more susceptible to GBS infection than full-term babies, but most (75 percent) babies who get GBS disease are full term. GBS disease may also develop in infants 1 week to several months after birth ("late-onset disease"). Meningitis is more common with late-onset GBS disease. Only about half of late-onset GBS disease among newborns comes from a mother who is colonized with GBS; the source of infection for others with late-onset GBS disease is unknown.
How is GBS disease diagnosed and treated?
GBS disease is diagnosed when the bacterium is grown from usual sterile body fluids, such as blood or spinal fluid. Cultures take a few days to complete. GBS infections in both newborns and adults are usually treated with antibiotics (e.g., penicillin or ampicillin) given through a vein.
Can pregnant women be checked for GBS?
GBS colonization can be detected during pregnancy or just before delivery by a vaginal and rectal swab for special culture or rapid screening. Rapid screening tests are not as good at detecting the bacteria but can be completed in 30 minutes to a few hours. Health care providers who culture for GBS colonization during prenatal visits should do so late in pregnancy because cultures collected before 25 weeks' gestation do not predict whether a mother will be colonized with GBS at delivery. Authorities suggest that cultures be done at 35-37 weeks' gestation, by swabbing both the vagina and rectum. A positive culture result means that the mother is colonized with GBS - not that she or her baby will definitely become ill. Colonized women should not be given oral antibiotics before labor because antibiotic treatment at this time does not prevent GBS disease in newborns. Whether a woman is colonized with GBS becomes important at the time of labor and delivery when antibiotics are effective in preventing GBS disease.
Can GBS disease among newborns be prevented?
Most GBS disease in newborns can be prevented by giving certain pregnant women antibiotics through the vein during labor. Any pregnant woman who previously had a baby with GBS disease or who has a urinary tract infection caused by GBS should receive antibiotics during labor. Pregnant women colonized with GBS should be offered antibiotics at the time of labor or membrane rupture. Colonized women at highest risk are those with any of the following conditions:
- Fever during labor.
- Rupture of membranes 18 hours or more before delivery.
- Labor or rupture of membranes before 37 weeks ("pre-term")
Because women who are colonized with GBS but do not develop any of the above complications have a relatively low risk of delivering an infant with GBS disease, the decision to take antibiotics during labor should balance risks and benefits. Penicillin is very effective at preventing GBS disease in the newborn and is generally safe. A colonized woman with none of the conditions above has the following risks:
- A 1 in 200 chance of delivering a baby with GBS disease if no antibiotics are given.
- A 1 in 10 chance, or lower, of experiencing a mild allergic reaction to penicillin (such as rash).
- A 1 in 10,000 chance of developing a severe allergic reaction (anaphylaxis) to penicillin.
Anaphylaxis requires emergency treatment and can be life-threatening.
If a prenatal culture for GBS was not done or the results are not available, health care providers may give antibiotics to women with one or more of the risk conditions listed above.
What research is being done on prevention of GBS disease?
Unfortunately, some babies still get GBS disease in spite of testing and antibiotic treatment. Vaccines to prevent GBS disease are being developed. In the future, women who are vaccinated may make antibodies that cross the placenta and protect the baby during birth and early infancy.
Who is at higher risk for GBS disease?
Pregnant women with the following conditions are at higher risk of having a baby with GBS disease:
- Previous baby with GBS disease.
- Urinary tract infection due to GBS.
- GBS colonization late in pregnancy.
- Fever during labor.
- Rupture of membranes 18 hours or more before delivery.
- Labor or rupture of membranes before 37 weeks ("pre-term").
- Adults with illnesses that suppress the immune system, such as diabetes or cancer, are at higher risk of getting GBS disease.
For more information, contact:
Childhood and Respiratory Diseases Branch
Division of Bacterial and Mycotic Diseases
National Center for Infectious Diseases
Centers for Disease Control and Prevention
MS C-09
1600 Clifton Rd NE
Atlanta, GA 30333
GBS INFORMED CONSENT
Informed Consent/Informed Declination for Antepartal GBS Testing
I _________________________________________, would like / not like (circle one) to be tested for GBS at this time.
I understand that there is no "perfect" answer for strep - no perfect screening program, no perfect protocols which will identify and prevent all strep infected babies; that no method of screening and/or prophylactic treatment is 100% effective in preventing GBS. All that we can do is reduce the incidence. I have had my questions answered and can make an informed decision regarding GBS testing.
_______________________________________ (client) ________________ (date)
_______________________________________ (spouse) ______________ (date)
_______________________________________ (midwife) ______________ (date)
For More Information About GBS and Holistic Alternative Therapies:
MoonDragon's Birthing Guidelines: Strep B (Pregnancy)
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