Many people out there are unaware that they are infected and therefore carriers of the virus who can transmit it to someone else. Some who know or think they have such a disease will dismiss it as trivial "as long as it's non-fatal" i.e. as long as it isn't HIV/AIDS, it's nothing to worry about, be tested for, or disclose to another person.
“Many people out there are unaware that they are infected and therefore carriers of the virus who can transmit it to someone else.”
Which is different from all the other 6 diseases I mentioned. Which is the point. It’s not a communicable disease, because it’s very easy to protect yourself from contracting it.
That you can’t infect someone by incidental contact tells us that there is a big functional difference in the virus from other diseases. It also makes it a poor candidate for vaccinations.