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Thousands of Greater Toronto Area children with incomplete or missing immunization data may be suspended from attending school if their immunization records are not up to date.

Toronto Public Health officials say warning notices are expected to go out to more than 45,000 students in the city who still lack the necessary documentation.

Since 2014, children now need to have proof of immunization against meningococcal disease, whooping cough and chickenpox to attend school.

The new requirement is in addition to having been vaccinated against diphtheria, tetanus, polio, measles, mumps and rubella.

READ MORE: Ontario proposes tougher rules for exempting school kids from vaccinations

Toronto Public Health says it is the parent's responsibility to update their child's immunization record or provide a valid exemption form.

According to the Ontario Health Ministry, all children attending school between ages 4 to 17 need to be immunized according to Ontario's Immunization Schedule.

Health officials say children have followed the routine immunization schedule will already have received all the vaccines they need to attend school.

However, parents are still required to report these immunizations to their local public health unit.

LET US KNOW: Are you a parent with a child who has recently been suspended for incomplete immunization data? If so, leave us a comment below and we may contact you for a future story.