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Penicillin label, then C. diff
Why labor needs antibiotics
A woman who carries group B strep, a very common vaginal infection, must be given antibiotics before delivery so the baby is not exposed. The antibiotic of choice is in the penicillin family, and penicillins are known to be safe and effective in pregnancy. A woman thought to be allergic gets vancomycin instead, and if it is not dosed appropriately, the baby can be considered inadequately treated. That can lead to more decisions, such as antibiotics for the baby or time in the NICU.
One complication after another
This mother was thought to be allergic, so she was given vancomycin. She developed red man syndrome, where the body turns completely red and flushed and other medications have to be given. After her C-section she got a wound infection, and because the label was still on her chart, she was treated with clindamycin. The clindamycin gave her C. diff, which needed its own treatment. It was one thing after another.
She was eventually cleared of the penicillin allergy by an allergist. For obstetricians, the label is hard to work around. A pregnant woman is not tested on the off chance that she is one of the rare people who is truly allergic, because nobody wants to put her into anaphylaxis, so the label sticks.
Why does group B strep matter at delivery?
Group B streptococcus lives harmlessly in the intestines and vagina of roughly one in four women. During birth, a baby can inhale or swallow it, and in newborns it can cause sepsis, pneumonia, and meningitis. The US Centers for Disease Control and Prevention began recommending preventive antibiotics during labor in the 1990s. Rates of early-onset disease in newborns have since fallen sharply.
What is red man syndrome?
Red man syndrome, now often called vancomycin infusion reaction, is a flushing of the face, neck, and upper body. It is caused when vancomycin makes mast cells release histamine directly, without any allergic antibodies involved. The reaction is tied to how quickly the drug runs into the vein, so a slower infusion rate lowers its likelihood. It is not a true allergy, even though it looks like one.
How does clindamycin lead to C. diff?
The gut is home to trillions of bacteria that keep Clostridioides difficile in check. Broad antibiotics like clindamycin wipe out many of those competitors, and C. difficile spores survive them. With rivals gone, the bacterium multiplies and releases toxins that inflame the colon. Clindamycin is among the antibiotics most strongly linked to C. diff infection.
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