From forexblog.org

In October, I wrote about a “separation” that had taken place in currency markets between the “sick” currencies and the “healthy” currencies. At the time, I argued that the former category was comprised mainly of the Dollar and the Pound, with most other currencies healthy by comparison. While I still stand by this paradigm, I would like to revise it slightly. Specifically, I would like to add the Euro and the Yen to this list.