Until 1996, public health staff at a statewide network of 60 Pennsylvania state health centers provided tests for HIV, sexually transmitted diseases (STD) and tuberculosis (TB); treated people with communicable diseases; conducted community outreach to inform, test, and treat others at risk; immunized infants; and investigated and responded to food-borne and other disease outbreaks. These staff, primarily public health nurses, also provided maternal and child health care, injury and lead-poisoning prevention services, and public health advice to child care centers, schools, and physicians.