Provides immunizations for communicable diseases and for foreign country travel. Offers flu and pneumonia shots. Tests for sexually-transmitted diseases such as HIV/AIDS and for other communicable diseases like TB. Investigates disease outbreaks. Other services include information on communicable diseases, investigations of suspected disease outbreaks, and preventive treatment for certain diseases. Outbreak investigations can be for suspected food or waterborne diseases, bioterrorist events, and contagious diseases spread to humans by either animals or other persons.