Kids getting sick at school

Am I the only parent that seems to notice this? Everytime my kids get the cold or flu it is always from school. I think this is partly due to the fact that we now have both parents in most households working and they cannot afford to miss a day of work if they were to stay home with a sick child. So instead of keeping sick children home, most parents will often send them to school knowing that they could infect other students in their class. This is why I'm considering homeschooling for my children.