Which types of masks might be used in a possible influenza pandemic? How are they to be used?

The following two main types of masks can be used in a possible influenza pandemic :

Surgical masks:
These masks can be fit loosely around the face and so as to allow the air
to escape on either side. Surgical masks are disposable and should be
used only once, by one person.

N95 or P2 Respirators (known as filtering face- pieces):
These masks can be sealed tightly onto the face, so most air passes through the masks upon inhalation. Respirators may be worn by individuals at risk of exposure to a respiratory hazard.