Colorado lawmakers advanced a proposal to make it harder to send kids to school without vaccinations.
Colorado is experiencing the worst flu season since 2009, especially for young adults.
The decision to vaccinate a child is a personal one, but in New York City the health board recently passed a mandatory flu shot plan for some children under six.
We are heading into cold and flu season and there have been more than a thousand cases of whooping cough so far this year.
All over the U.S. more parents are opting out of vaccinations for their children and Colorado has one of the highest rates of exemptions in the country.