Gender Specific Illnesses

The girls and I are sick. We are sharing a cold. The boys all seem to be fine. I have to wonder why just us girls are sick? If it were the boys, I could understand, they go to school and are surrounded by people and therefore germs all day. The girls and I are usually home. Maybe we need to get out more, or maybe I just need an excuse to do more shopping. I still think this cold is gender specific. This is not the first time those of the female gender in our family suffer while the males seem to escape. I think it is a conspiracy.