Indiana data show that more than 7,000 cases of viral hepatitis were reported in the state during 2015.
The rate of flu deaths has nearly doubled in the past month.
Those who've already received two doses of the vaccine could still be at risk for contract mumps.
The Indiana Youth Institute released its Kids Count Report Monday. Much of the information focuses on the health of Hoosier kids, including immunization rates.
The State Department of Health recommends a three-pronged approach to fighting the flu: get a vaccine, cover coughs and sneezes, and stay home if you’re sick.
Parents will be able to view their child's vaccinations records online using the state website.
The delay comes after officials expressed concern that the policy change would keep many kids from getting vaccinated for the upcoming school year.
Many physicians have been sending insured patients to public health clinics, which receive government funded vaccines.
State health officials say Indiana is experiencing its largest outbreak of whooping cough, including two infant deaths, since 1959.