Suppose a person contracts a virus. We say that s/he has been infected or has an infection. Now, if s/he also develops symptoms, we say that s/he has the disease. A disease has symptoms that clearly manifest themselves. If a person has a disease, they will show the signs of illness.
But not all infections necessarily manifest symptoms. So, not all infections become “disease”. But the infection is still there, i.e. the person is still infected.
So, when you call it STI, you don’t have to specify if it turned into a disease or not.
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