You probably read the story.
The lede: One drop of blood can give your life time history of viral infection. A single $25 test can find them all.
Here's more detail:
First, only 206 viruses are known to infect man. This is a manageable problem. That's true even if nose-cold rhinoviruses retweak their code every season.
Second, with major strains, we are still only facing about a thousand. Still manageable.
Third, amazingly, only about a dozen past species of infection are found in one person. Even though people with AIDS get exposed to more than that, this shrinks the problem of beating the bugs to a near trivial level.
How did they do it? They rounded up 93,000 snippets of DNA code off the "name-tags" of known viruses. In the lab they "crazy glued" them onto a tamed attack virus until they had custom built 1000 different attack viruses, one for each major strain of virus in man. The attack virus is called a bacteriophage, not because it's some kind of bacterium but because it likes to get inside bacteria and eat them.
A slurry of all 1000 attack viruses is mixed with one drop of blood. After a bit, everything is washed away and the attack viruses recovered. The ones with crud on the "name-tag" tell that you once were sick with that virus and made antibodies to it. Pay $25, wait a day for the results and push PRINT.
My wife says, "So, what do you do with that?"
Sources: Wired and Science Daily News.