Back to school seasons mean that cold and flu viruses spread quickly. Yuck.    During summer vacations, kids might get a virus, feel the symptoms and take a day or two to get over it.    Now the same kids can bring it to school and spread it around to his or her classmates. They bring it home to the parents, who then take it to work.   I don’t have time to take a sick day, and I’m sure my daughter would rather have her Daddy in tip-top condition for rolling  ...