LANSING, Mich. (AP) - Gov. Rick Snyder has signed legislation updating the grade at which Michigan students must submit a certificate of immunization to schools. The new laws singed Tuesday require students to submit the certificate upon entering seventh grade instead of sixth grade. The governor's office says the change will better accommodate the age at which most students receive vaccinations and will allow school districts more time to alert parents about needing vaccinations. It also gives parents and health care providers more time to schedule immunizations. In 2010, vaccinations for tetanus, diphtheria and pertussis as well as meningococcal vaccines were added to the existing Michigan school rules and required for students entering sixth grade if they were at least 11 years of age at the time they entered sixth grade.