New chicken owner. Lost five chickens in the last 3 weeks our first had avian pox ( talked to a dr from a&m) we thought that was the reason we were losing them but after doing some reason we thought it could be worms. We went to the feed store and got wazine 17. The worms were never in their poop as we have been looking at it daily. We lost our 5th one this morning and I asked my sweet hubs to cut her open and take a look since I read about people doing that to check for worms. He did and she has ton sand tons of them. They are round worms. We are going to treat with the wazine. Is this best? Should we being doing anything else along with this? Please help. We read that a dirty coop could be the cause. We have them in a 260 sq ft coop with mulch floor and fenced. We let them out about 4 hours a day to free range.