Versions of Iowa Code 239B.12 - Immunization on LawServer 2024 Iowa Code 239B.12 – Immunization 2023 Iowa Code 239B.12 – Immunization 2022 Iowa Code 239B.12 – Immunization 2020 Iowa Code 239B.12 – Immunization 2018 Iowa Code 239B.12 – Immunization 2016 Iowa Code 239B.12 – Immunization 2014 Iowa Code 239B.12 – Immunization. 2009 Iowa Code 239B.12 – Immunization