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This year, 1,686 first notices were issued, the health unit stated in a release Thursday.

"In order to attend school in Ontario, students must comply with the Immunization of School Pupils Act, 1990 (ISPA), which requires students to be vaccinated against or obtain a valid exemption for the following diseases: tetanus, diphtheria, pertussis, polio, measles, mumps, rubella, meningococcal disease, and varicella," officials said.

"It is crucial for parents to realize that immunization records are not automatically reported by health care providers to CK Public Health. Thus, parents may receive a first notice letter even if their child has received all required vaccinations."

To ensure compliance with the ISPA and avoid any potential suspension, the health unit asks parents to take the following steps: