Use 'communicable' to describe illnesses that spread between living beings. After her diagnosis, we learned that she had a communicable disease.
Pro Tip 2/3
Method of Transmission
Specify how a disease is communicable: via air, touch, bodily fluids, etc. The virus is highly communicable through airborne particles.
Pro Tip 3/3
Preventative Measures
Mention 'communicable' when discussing how to prevent the spread of a disease. Wearing masks reduces the risk of spreading communicable respiratory infections.