CDC’s update of February 9 indicates that the case count is now 600 with illnesses connected with the outbreak being reported in 44 states. The onset date of the most recent illness associated with the outbreak was January 23.
Also, CDC has informed me that the PulseNet pattern JPXX01.0459 is indeed a new pattern that was first submitted to the PulseNet National Database in September 2008. (I had previously guessed that it was an old pattern. Apparently, some of the old pattern numbers assigned by the National PulseNet Database Team are being recycled.)