I did a search on worming and still did not find an exact answer. Someone said worm them, reworm in 10 days and wait 14 more days to eat eggs. It was a wormer for horses that kills more than just round worms. There is a lot of controversay in some of these posts.
Good luck with yours.
I am not sure anyone has worms, all look healthy except for a hen that died today. She has been thin and looked droopy for almost a month but she was molting. I haven't seen evidence of worms in her or others but thought it might be a good precaution. However I have decided I am saving up eggs before I do it and will try to find out some more info on what to use and safety of it.