Went through something similar recently, cold that caused me to back off of high intensity in training for a few days but nevertheless became bronchitis and knocked me out of training for about 5 days. So all in all, a 10 day deviation from the plan.

It took me about a week after resuming to feel pop in my legs on the bike and I definitely lost fitness with my run. I ran a big road race here in Madison about 2.5 weeks after resuming training and underperformed relative to my goals. I did a couple of speed sessions in those 2.5 weeks, and I noticed a bit of dropoff but no red flags.

Just acknowledge to yourself going into your race that your base is big enough to carry you through and still do quite well, though you have possibly lost some top end speed/ performance. Not to make excuses before you even toe the line, but just to do a bit of an expectations reset in that your time away due to illness may have bent the curve a bit relative to where you were expecting to be when you circled this race on your calendar.

thanks for the input!
I will try to focus on speed a bit I think.
But as you say, accepting that your not at your best is probably a good idea.
Pacing will be different as well.