The germs are almost always present in the nose and throat. It is
exposure to a draft plus the presence of germs and a lowered resistance
of the body which produces the usual cold. Army men have often noted
that as long as they are on the march and sleep outdoors, they seldom or
never have colds, but they develop them as soon as they get indoors
again. See SUPPLEMENTARY NOTES, 'Avoiding Colds.'
