Neena,
I took Enbrel for many years, along with methotrexate, and now I'm on Orencia in lieu of the Enbrel. It was always my rheumy's advice to stop the biologics (whichever one I was on), Enbrel and/or Orencia, but continue to take the methotrexate. Evidently, Methotrexate does not work the same way as the biologics, and hence does not pose the same danger of infections that biologics carry. I continued to take methotrexate while being treated for latent TB, and through any run of the mill flu or cold I might get. I would NOT, however, take Enbrel or Orencia or any other biologic while sick. Like Don D, my doctor suggested airborne (or the equivalent) whenever I get a cold. I haven't tried it yet, but it sounds like it might work very well.
Hope you feel better soon.
Elcamino