Students have until the end of March to update their immunization records.
Lambton Public Health's Erin Courtney says 4,000 notices have been issued to area elementary students this year.
She says up-to-date immunization is the best way to protect communities and schools from outbreaks that can cause unnecessary illnesses and deaths.
Courtney advises parents to act as soon as possible.
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Lambton Public Health says the records include immunizations for diphtheria , tetanus, polio, mumps, rubella, measles , and new this year, meningitis, whooping cough and chicken pox for children born in 2010 or later.