The Central York School District has made repeated efforts to contact parents about new state vaccination requirements, Assistant Superintendent Robert Grove told the school board during a meeting Monday night.

On May 1, students who have not completed their vaccinations will not be able to attend school, which Grove said was "difficult to fathom."

The new regulations for the 2011-12 school year require students in seventh grade to receive the meningococcal conjugate vaccine, which protects against meningitis, and a dose of the tetanus, diphtheria and acellular pertussis vaccine (Tdap), according to the state health department. All students from kindergarten through 12th grade must get a second dose of the chickenpox vaccine.

Schools were given eight months from the first day of school to make sure student immunizations were up to date. After the deadline, students without the proper immunizations are not allowed to attend school.

"We have done a great deal of work to be proactive," Grove said.

The district currently has 134 students attending school without records they have received the proper vaccinations, but that number of students continues to decrease daily, Grove said.

The administration is still determining how they will handle students who show up at school May 1 and have not completed the vaccinations.