The Knox County Health Department says 2010 vaccination guidelines have been adding up to weeks of middle school absenteeism across the county.
Sixth graders now need a proof of immunization certificate for chicken pox - tetanus - diphtheria and pertussis before they can start seventh grade.
But Mary Ann Harrison, nurse manager of the Immunization Program at the Knox County Health Department, says as many as 40% of rising seventh graders in Knox County public schools last year didn’t get the shots.