Florent presented an article from the Guardian about a medical concen which is very important today: the HIV.
First, he explained the features of this incurable disease. The problem is that for many people it is diagnosed too late: actually many people who are infected do not know they are since, during the asymptotic phase, you don't feel you are sick.
So testing is very important for those who are sick, but also for the others.
In Great Britain, a measure has been created to increase the test and make it easier. It plans to test the persons every time they go to the doctor in specific areas.
Indeed, it is less costly to do prevention. This measure has shown its effectiveness.

In France, such a measure do not exist. But when you offer your blood for instance, you can be informed that you have a contageous disease if you are infected by the HIV. However the letter do not mention the word 'HIV'. In this case, you are required to go to the doctor.
People have to ask for the information by themselves but many of them don't go to the doctor when they receive the letter.
We can think that it would be a good idea to tell people directly in the letter they are infected, but at the same time, it is a very impersonal and abrupt way to inform somebody about his illness.

That's why Florent asked: "Do you think you have the moral obligation to tell somebody who has a dangerous illness to know it even if he doesn't want to do?"

He showed that, even if it seems to be beneficial for everyone, there is an ethical issue about it: you cannot force somebody to know an information he doesn't want to know because it contradicts the individual rights. Several persons agreed with him, and some even said that it was only the problem of the person who is infected: according to them, the solution is just to have protected sex and to be careful.
This is a terrible issue because it deals with public health, that's why some persons did not agree with that: they think this issue is too serious and those who don't want to know they are sick threaten the health of the others.

But I think Florent is right: you cannot force somebody to know something he doesn't want to know. An important prevention has to be organised to prompt people to test themselves, but this is not a solution to force them to know because it can become very hard for them to accept their illness in that case. The risk would be a kind of stigmatization's feeling.