How Do You Get Gbs In Pregnancy? Step By Step

Group B strep (GBS) is a common bacterium that many pregnant women carry naturally in their digestive tract or lower genital area. You do not “catch” it from a specific action, and it is not a sexually transmitted infection. The bacteria can come and go on their own, and most women who carry it feel completely fine. The main concern is passing it to your baby during labor, which is why routine testing near the end of pregnancy is standard care.

What Is Group B Strep and Why Does It Matter?

Group B strep is a type of bacteria that naturally lives in the body. It is not the same as the strep throat bacteria. Many healthy adults carry GBS without ever knowing it. Estimates suggest that about 1 in 4 pregnant women carry it at some point.

For the mother, GBS usually causes no harm. The risk is for the newborn. If a baby is exposed during birth, there is a small chance of developing a serious infection. This can include pneumonia, sepsis, or meningitis. Because of this risk, testing is a routine part of prenatal care.

How Do You Get GBS in Pregnancy? Step By Step

The bacteria are not picked up from public toilets, swimming pools, or food. GBS lives naturally in the intestines, rectum, and vagina. It is part of the normal balance of bacteria in some people. Carrying GBS is not a sign of poor hygiene, and it is not a disease.

Here is how the process works step by step:

• Step 1: The bacteria are already present in your body. They may be there for a while or just for a short time. You cannot control this.
• Step 2: During pregnancy, the bacteria can move between the rectum and the vagina. This is normal.
• Step 3: Near the end of pregnancy, around week 36 or 37, your provider offers a swab test. A cotton swab is used to sample the vagina and rectum.
• Step 4: The sample is sent to a lab. The result tells you whether you are carrying GBS at that moment.
• Step 5: If the test is positive, you receive IV antibiotics during labor. This greatly reduces the chance of passing GBS to your baby.

The key point is that you do not “get” GBS from anyone. It is already there. Testing is the only way to know if you carry it, because most women have no symptoms.

Can You Prevent Getting GBS in the First Place?

No. There is no proven way to prevent carrying GBS. It is not something you can wash away or treat before labor. Some online sources suggest probiotics or certain diets can clear GBS. There is no strong clinical evidence that any of these methods work.

The bacteria can also come and go. A woman who tests negative one week could test positive the next week. This is why the test is done so close to the due date. It gives the most accurate picture of your status during labor.

Some research has looked at whether probiotics can reduce GBS colonization. The evidence is limited and mixed. No major clinical guideline currently recommends probiotics for this purpose. If you are interested in trying them, discuss it with your provider. But know that the evidence does not confirm they work.

What Happens If You Test Positive for GBS?

A positive GBS test is common and manageable. It does not mean you or your baby will get sick. It simply means you carry the bacteria. The standard response is to give you antibiotics through an IV once labor starts.

The antibiotics are usually penicillin or ampicillin. If you are allergic to penicillin, your provider will choose a different antibiotic. The goal is to have the medicine in your system at least 4 hours before delivery. This timing has been shown to be most effective at reducing the chance of passing GBS to the baby.

If you have a planned cesarean section and your water has not broken, you may not need antibiotics. The risk of passing GBS is much lower in that situation. Your provider will give you specific instructions based on your circumstances.

Are There Risk Factors for Passing GBS to Your Baby?

Even if you carry GBS, the chance of passing it to your baby is low. With proper antibiotic treatment, the risk drops significantly. Some factors increase the risk of a baby becoming infected.

• Testing positive for GBS during this pregnancy
• Having a previous baby who had GBS disease
• Going into labor before 37 weeks
• Having a fever during labor
• Your water breaking 18 hours or more before delivery

If any of these risk factors are present, antibiotics are typically recommended even if your GBS test result is unknown. This is a safety measure. It is better to treat than to risk a newborn infection.

What Are the Signs of GBS Infection in a Newborn?

Most babies exposed to GBS do not get sick. But when infection does occur, it usually appears within the first week of life. Early-onset GBS disease is the term used for infections that happen in the first 7 days.

Signs to watch for include:

• Fever
• Difficulty feeding
• Lethargy or floppiness
• Irritability
• Trouble breathing or grunting
• Changes in skin color, such as paleness or a blue tint

If your baby shows any of these signs, get medical help immediately. Newborn infections can progress quickly, so early treatment matters. With prompt care, most babies recover fully.

Does GBS Affect Future Pregnancies?

Carrying GBS in one pregnancy does not mean you will carry it in the next. Each pregnancy is different. You will be tested again in each pregnancy because the bacteria can come and go.

If you tested positive in a previous pregnancy, let your provider know. Some providers may recommend antibiotics in labor based on that history alone, even if you test negative later. This practice varies by provider and by current guidelines. Some clinical guidelines suggest that a prior positive test is enough reason to treat, while others recommend relying on the current test result.

Talk to your provider about your specific history. They will help you decide what makes sense for your situation.

Is GBS the Same as Strep Throat?

No. This is a common confusion. Strep throat is caused by Group A strep. GBS is Group B strep. They are different bacteria with different effects on the body.

Group A strep causes throat infections and skin infections. Group B strep lives in the digestive and reproductive tracts. It does not cause sore throats. The name sounds similar, but the bacteria are not interchangeable.

You do not need to worry about spreading GBS like you would a cold or flu. It is not airborne. It is not spread by coughing or sneezing. It is simply a part of your body’s natural bacterial environment.

What About GBS in the Urine?

Sometimes GBS is found in the urine during a routine prenatal urine test. This is different from carrying GBS in the vagina. If GBS is in the urine, it means the bacteria have traveled to the urinary tract. This may cause a urinary tract infection.

If GBS is found in your urine during pregnancy, you will likely be treated with oral antibiotics at that time. You will also be treated with IV antibiotics during labor. This is because GBS in the urine is a sign of heavier colonization, and the risk to the baby is higher.

This situation is managed carefully. Your provider will explain the plan. It is important to take the oral antibiotics exactly as prescribed if they are given to you.