Which organism is NOT among the four specifically listed in the compendium as shedding during birthing?

• A. Coxiella burnetii
• B. Brucella spp.
• C. Escherichia coli
• D. Leptospira spp.

Answer: (C)

During parturition, certain zoonotic pathogens are shed directly in birthing materials such as placenta, amniotic fluid, and vaginal secretions. The compendium highlights a group of organisms known to appear in those birth products, because their presence there creates a clear exposure risk for people assisting with birth. The organisms listed as shedding in birthing materials include Coxiella burnetii and Brucella species, which are classically associated with reproductive tissues, as well as Leptospira species, among others.

Escherichia coli, while a common inhabitant of the gut and a frequent cause of disease, is not specifically singled out in the compendium as a birthing-shedder. Its usual transmission is via fecal contamination or environmental exposure rather than being routinely shed in birth products. Therefore, it is the organism not on that list, which is why it’s the correct choice in this context.