MO HB690

Allows the Department of Health and Senior Services to modify immunization requirements to include "zero frequency," meaning certain vaccines may not be required at all.

Permits students to attend school with satisfactory evidence of "otherwise acquired immunity" in addition to vaccination records.

Expands exemptions for immunizations to include religious beliefs and medical contraindications, requiring only a written parental objection for religious exemptions.

Applies the same immunization standards and exemption procedures to day care centers, preschools, and nursery schools caring for 10 or more children.

Restricts the Department of Health and Senior Services from requiring immunizations beyond the eight diseases specified in the statute: poliomyelitis, rubella, rubeola, mumps, tetanus, pertussis, diphtheria, and hepatitis B.