I'm not sure how the resolution for this would work. Does the CDC even officially declare epidemics?
Here's their page on the current situation, and a screenshot of the current status. By some definitions, this might already qualify as an epidemic among wild birds and dairy cattle, though I'm assuming you meant this to ask about humans.
H5 Bird Flu: Current Situation | Bird Flu | CDC
Thank you so much for correcting my ignorance. I deeply apologize to you. I believe it is the surgeon general that would declare an epidemic. The CDC current public health risk is low. The CDC does issue information about disease outbreak through their Health Alert Network. Because of my mistake, I will do no more betting on this question. Again, I apologize.