@rasterman @matrix @sizzletron Yeah, that's all correct.
Though the fact check is cringe.
0.7% spread isn't 0%... sure... but those 0.7% are probably teens licking toilets.
Having no symptoms doesn't mean you can't infect anyone, as I mentioned earlier.
But as the study shows, infection rates are significantly lower, since you're not coughing up snot at people around you.
For most illnesses, when you don't have symptoms, you are less of a vector for the disease.
Asymptomatic doesn't mean your body isn't fighting it off, like in the case of people who are un-infectible.
Your immune system gets a workout, and gains resistance, if your body fought off something.
Even if you didn't notice it happened.
People who inherit two copies of the mutant CKR-5 gene, one from each parent, cannot be sick with aids.
The virus cannot reproduce in their body, unable to dock with their cells, it dies out.
But they can still transmit it to others for a short time.
To the best of my knowledge, that's the highest level of immunity: being un-infectible.