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LS好象说的不对吧, 其实是2楼说的那个. Group B streptococcal. 是在存在于女生阴道的.
"Do All Women Carry GBS?"
If 1000 women, regardless of race or socioeconomic status, had a vaginal culture taken, 150-350 would test positive for GBS. Because GBS usually does not cause problems for the adult female, most women carry it and do not know it. Yet, GBS can cause serious illness in babies born to women who carry the bacteria.
"Is GBS a Sexually Transmitted Disease?"
Since GBS is normally found in the vagina and/or rectum of colonized women, one way it can colonize another individual is through sexual contact. However, this bacteria usually does not cause genital symptoms or discomfort and is generally not linked with increased sexual activity. Therefore GBS is not considered to be a sexually transmitted disease.
"How Common Are GBS Infections?"
Out of every 1000 births, three babies will become ill with GBS. Why only certain infants fall victim to this infection is not completely known. An estimated 12,000 babies will suffer from GBS infections each year.
"What Complications Does GBS Cause?"
Most often, GBS colonizes the baby during labor either by traveling upward from the mother's vagina into the uterus, or as the infant passes through the birth canal. Illness occurs when the bacteria enters the baby's blood stream. This can then lead to shock, pneumonia, and meningitis (an infection of the baby's spinal fluid and brain tissue). In certain cases, evidence exists that GBS may cross intact membranes to infect the baby in utero. All of these conditions are life threatening. This year alone:
* an estimated 2000 babies will die;
* large numbers will suffer permanent handicaps such as brain damage ranging from mild learning disabilities to severe mental retardation, loss of sight and hearing, and lung damage (full statistics do not exist for the total number of surviving babies who will have these permanent handicaps);
* others will survive with no long-term damage.
GBS is also responsible for causing infections in nearly 50,000 pregnant women each year including fever after birth, uterine inflammation, and infections following cesarean sections.
"When is GBS a Threat?"
GBS can be present in a woman's first pregnancy, or in following pregnancies. The bacteria can be a threat both during pregnancy and at the time of delivery. It has been shown that women who carry large amounts of the bacteria are at greatest risk of having a baby infected with GBS. Also, the occurrence of GBS infections are increased in certain high risk situations.
HIGH RISK SITUATIONS:
* When labor is premature;
* When there is premature rupture of the membranes;
* When there is prolonged rupture of membranes (>12 hours) before the baby is born;
* If the mother has a fever (>100.4 F) before or during labor;
* Women who have a history of GBS in previous births.
"Can GBS Infections Be Prevented?"
Yes. There is a fast and effective treatment for many situations. Medical research indicates that giving antibiotics through the vein to the mother during labor can greatly reduce the frequency of GBS infection in the baby immediately after birth or during the first week of life.
Treating the mother with oral antibiotics during the pregnancy may decrease the amount of GBS for a short time, but it will not eliminate the bacteria completely and will leave the baby unprotected at birth. Also, waiting to treat the baby with antibiotics after birth is often too late to prevent illness.
"How Do I Know If I Carry GBS?"
Some doctors routinely screen for GBS by doing cultures on their patients during pregnancy. These cultures must be taken from the lower vagina and rectum, not the cervix.
Women who are found to carry the bacteria can then be treated as potential GBS risk patients. But, just like any other bacteria in the human body, GBS can be present in small amounts on one day which would result in a negative culture. Therefore, one negative culture result does not guarantee that you will be negative on the day you deliver. (Current studies indicate that a lower vaginal AND rectal culture done late in pregnancy is more than 93% accurate in detecting who will not carry the bacteria at delivery.) |
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