Use sunscreen to the face and lips before prolonged exposure to the sun.

A prolonged winter would grant a few more weeks' grace before such exposure.

The product should be applied at least 15 minutes before possible exposure.

Before exposure, questions were asked about the word.

Vaccination now is recommended 14 days before exposure to the virus.

Tan accelerators have to be used on at least three consecutive days before exposure to the sun.

The image of the woman he saw, long before exposure or hunger could have affected him.

But these early studies suggest that the drug could be effective if given within three days before or after exposure to the virus.

Apply sunscreen at least a half hour before exposure, and reapply often.

The concept of providing a preventive drug before exposure to an infectious agent is not new.