I know that it is advisable to clean the vaccine vial stopper with an alcohol wipe after removing the protective cap from a vaccine or diluent vial. Do you have to wait for the alcohol to dry before you insert the needle in to the stopper?

The stopper of a single-dose vial is often assumed to be sterile. However, not all vaccine manufacturers guarantee the tops of unused vials are sterile, and the manner in which the cover over the stopper is removed can potentially contaminate the stopper. Therefore, using friction and a sterile alcohol pad to swab the stopper may help to assure aseptic technique in preparing the single-dose vial prior to inserting a sterile syringe. Alcohol evaporates quickly and will dry while the needle is being prepared for insertion into the vial.