Yeah, I'm thinking your vet might give them Valbazen or Praziquantal, another tapeworm med. It is sold as Zimectrin Gold and Quest Plus gel, used in horses. Both are paste like. Dosage for chickens would be a 'BB' size paste ball on a piece of bread for each chicken like Valbazen. I prefer the Valbazen as it's easier to apply and less messy and kills multi types of tapeworms whereas the horse pastes tend to target only one or two types of tapeworms, try making a 'BB'size paste ball too,no fun there lol. Yes, if a worm was inside an egg,you'd most likely see it....odds are the worms wont pass into an egg. Besides plain yogurt, I like to give mine buttermilk(probiotic and coats their innards) mixed with canned beef catfood(protein), mixed in their feed. Sometimes I add plain white rice to the mix and they scoff it all up lol.