>you mean never ever?
I mean never ever. It is like AFB for wax moths. It is a spore forming bacteria. The spores last virtually forever. If a wax moth eats some then more spores are formed which also last virtually forever.
>like 5yrs from now?
Like 50 years from now.
>Is this bacterial edible for humans?
Yes. Bt is approved as safe for humans and is sold in the garden stores for controling cabbage worms and mosquito larvae. The particular strain in B401 was approved and certified for use in honey bee combs as being safe for bees and humans.
>If "never ever" then it would be very persistent in the comb.
Yes. VERY persistent. Just like AFB is for bees. A spore forming bacteria that kills wax moths. How cool is that!