Akenaton.

The 1 in 20, those living with AIDS are in no way relevant to your argument about prevention. They already have it. You can't prevent them from getting it.

The figure you need to look at is what you would call MSM newly infected divided by the total number of MSM people in the "demographic"

This comes out to 1 new infection per year per 79 MSM people. according to your figures and according to your proposal 4 of those 79 people (1 in 20) would already have been known to have HIV, so testing them would certainly a waste of resources.

How about a publicity campaign warning people what the danger signs are and asking them to look at those signs to see if they need to be tested?