What intervention is aimed at preventing potential infection after exposure to varicella in a pregnant woman?

The intervention specifically aimed at preventing potential infection after exposure to varicella in a pregnant woman is the administration of Varicella Zoster Immune Globulin (VZIG). This is an important measure for pregnant women who have had a significant exposure to varicella (chickenpox), especially if they are not immune to the virus.

VZIG contains antibodies against the varicella virus, which can provide passive immunity and help reduce the risk of developing varicella in exposed individuals. This is particularly crucial during pregnancy because varicella infection can lead to serious complications for both the mother and the fetus, including congenital varicella syndrome.

In contrast, antiviral medications like oral acyclovir are typically used for treatment rather than prevention, making them less appropriate in this context of exposure. Additionally, while antiviral prophylaxis may be considered in some cases, it is not the primary recommendation following exposure when VZIG is available. Immunotherapy does not pertain specifically to the prevention of varicella after exposure. Thus, the administration of VZIG stands as the correct choice for the situation described.