Concerning rubella infection during pregnancy, how common is congenital rubella syndrome in newborns?

Concerning rubella infection during pregnancy, how common is congenital rubella syndrome in newborns?

• A. It is common and often severe
• B. It is rare; rubella rarely has serious sequelae in children
• C. It always occurs if the mother is infected in early pregnancy
• D. It never affects the newborn

Answer: (B)

The key idea here is that congenital rubella syndrome (CRS) is uncommon in newborns, especially in populations with widespread rubella vaccination. When a pregnant woman does acquire rubella, the chance of CRS depends on how early in pregnancy the infection occurs—the risk is highest in the first trimester—but overall, the number of CRS cases remains low in the era of immunity and vaccination. So, CRS is rare in newborns because most rubella infections during pregnancy do not result in CRS, and serious outcomes, while possible, are not the majority. It’s not guaranteed to occur with early infection, and it’s not impossible for infants to be affected, but the overall incidence is low.

The key idea here is that congenital rubella syndrome (CRS) is uncommon in newborns, especially in populations with widespread rubella vaccination. When a pregnant woman does acquire rubella, the chance of CRS depends on how early in pregnancy the infection occurs—the risk is highest in the first trimester—but overall, the number of CRS cases remains low in the era of immunity and vaccination.

So, CRS is rare in newborns because most rubella infections during pregnancy do not result in CRS, and serious outcomes, while possible, are not the majority. It’s not guaranteed to occur with early infection, and it’s not impossible for infants to be affected, but the overall incidence is low.