Split and simplify the following sentence while retaining its full meaning: Until additional data become available , Zerit should be given during pregnancy only after special consideration; there is insufficient information to recommend Zerit for prevention of mother-to-child transmission of HIV .
 Simplified version:
Pending further data availability , Zerit should only be used during pregnancy after special consideration . There are insufficient data to recommend Zerit for the prevention of mother-to-fetal transmission of HIV .