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Answer:
Hi, There! First let's look at the meaning of communicable diseases
<em>Communicable diseases, also known as infectious diseases or transmissible diseases, are illnesses that result from the infection, presence and growth of pathogenic (capable of causing disease)</em>
So your Answer would be influenza, HIV
Hope this Helps!
There is no known beginning so they cant see how it started to form or how to cure it, the virus is also very difficult to predict what it is going to do, it is similar to cancer it could sit around and do nothing or one day it could go wild and kill somone
