A Star investigation found that one in three Arizona schools have vaccination levels that are below safe levels that prevent an infection from developing into a full blown outbreak. The Star has built two databases, one with two years of data for Pima County and another of all the schools statewide for the 2010-11 school year.

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The Arizona Department of Health Services has withheld data for schools with under 20 students in kindergarten, because officials fear the unvaccinated could be identified. The database of the state includes Pima County and has information on exemptions filled out by parents with a personal, religious or medical reason not to vaccinate.

The Star investigation found the largest number of unvaccinated children come not from exemptions, but from schools not following state law requiring that kids either be vaccinated or have exemptions. Nothing is being done to schools that don't follow the law.