What infectious diseases have to be reported to the health department?

It varies.: This varies from state to state. Diseases like syphilis and gonorrhea are prime examples that have to be reported, as are outbreaks of bacterial meningitis, e. Coli, and salmonella, especially if they are in clusters. These are mandatory to report to state health departments, but not required to report to the cdc (ctr. Disease control). Contact your state health dept. Or look at the cdc site.

Many: There are many infectious diseases that are reportable to the public health department but they differ from state to state.