in all honesty cold does not affect flu as it spend most of it's life at body temperature. it spends a teeny tiny amount of time in the air. it nomrally comes out in saliva or mucus and directly into the other person. this can happen just through talking.
and i was under the impression that it will spread just as fast as spanish flu. it isn't spreading as fast now as it lacks the amount of vectors needed. after a certain point it will grow expotentially.
and i'm not defeatist i'm a realist.