12/5/2008 — As of the week ending on November 22nd, Influenza activity was slightly trending upwards, although still below the epidemic threshold. 
Again, you may view the CDC information page here
Because the epidemics of the past few years have usually begun by the end of the year or beginning of the next, and peaking in mid to late February, I’d advise beginning flu prophylaxis now.
Please remember that adequate stores of Vitamin D are also very helpful in raising resistance to influenza.  For those of you who have not been tested, and who don’t get much sun or who wear a lot of sunblock, 2000 – 3000 Units of Vitamin D-3 daily are quite safe.  If you have reason to think that you may be vitamin D deficient, you should be tested.