It doesn't. Virus's make you sick not weather. Unless your talking more than the body can handle then its a reaction like heat stroke
Ummm...they don't cause either.
my understanding is...it doesn't..it can come from influenza..which isn't from the cold or rain...it's viral and bacterial.
no..but i'm thinking..maybe the cold and rain lowers your immune system to fight of the influenza. I bet the Eskimos aren't high on the percentage list.