Clark Ashton Smith,
Weird Tales — May 1950 (Volume 42…
(1950)
“ Although many colds may be started by a virus, it is these "secondary invaders," say many authorities, that are responsible for much of the misery you know so well. Listerine Antiseptic, if used frequently during the 12 to 36-hour period of "incubation" when a cold may be developing, can often help forestall the mass invasion of these germs and so head off trouble. Listerine Antiseptic's remarkable germ-killing action has been demonstrated time and again. ”
