A Pacific Northwest measles outbreak has some state lawmakers rethinking the so-called “philosophical” vaccine exemption as the number of confirmed cases of the virus grows to the dozens. Washington and Oregon are among 17 states that allow some type of non-medical exemption for childhood vaccines for “personal, moral or other beliefs.” In Washington, a bill introduced by Republican Rep. Paul Harris would remove the personal exemption for the combined measles, mumps and rubella vaccine, or MMR.