One blood test can reveal every virus you have ever been exposed to

From a quick read i think this is more USA based then anywhere else ATM but still of use to many maybe?

http://www.newscientist.com/article/dn27659-cheap-blood-test-reveals-every-virus-youve-ever-been-exposed-to.html?utm_source=NSNS&utm_medium=SOC&utm_campaign=hoot&cmpid=SOC%257CNSNS%257C2015-GLOBAL-hoot#.VXCc64m3PbU