Indiana ranks in the bottom half of states for on-time infant vaccinations.
New requirements for school entry are intended to stop spread of disease, and to calm nerves, after last year's outbreaks.
Five more people have died in Indiana from the flu. Two of those were in long term care facilities.
Many physicians have been sending insured patients to public health clinics, which receive government funded vaccines.
Students in Vigo County School Corporation who have not met new vaccination requirements by March 21 will kept out of school.