Communicable & Infectious Diseases

A communicable disease is any contagious illness caused by bacteria or viruses. It can be spread from person to person or from animal to person. These diseases can be spread via contact with contaminated surfaces, through the air, bodily fluids like blood, or through insect bites.

Infectious diseases are caused by germs like bacteria, viruses, or fungi entering the body and rapidly multiplying. This can cause an infection. Many infectious diseases are also contagious (communicable) and able to spread through air, liquid, food, and other germ-riddled places.


This office division coordinates infectious disease prevention and control programs. It investigates sources of sexually transmitted disease infection, provides treatment, and applies preventive measures. Field offices provide confidential counseling and testing for HIV/AIDS. Other HIV/AIDS services include educational materials, training for the public, schools, and health care providers as well as the Ryan White Part B CARE Program (assistance with health care costs for those with HIV disease).

Reportable Disease List

Find Ways to Protect Yourself from COVID-19, Flu, and RSV