As for the Gallmycin, my vet told me to just treat the whole flock at the same time, so I used it in both the quarantined hens as well as the healthy ones,which is probably a good idea anyway.
As for natural worming, I read an article and saved it on the fridge. I don't know if you can get access to any fresh pumpkins this time of year, but here is the 'recipe':
Ingredients:
Fresh whole garlic (can possibly be mixed into warm oatmeal to disguise)
Whole vine-ripe pumpkins (split open in halves)
Unsalted pumpkin seeds (offer enough seeds so that each of your birds can ingest up to 1 tablespoon of seeds daily)
Large whole raw carrots (beneficial, but optional) (I put mine through the blender to chop them up into fine pieces)
Dandelion greens (beneficial, but optional)
Directions:
Once or twice a year, in addition to your flock's mainstay/regular daily chicken feed, also offer the above ingredients free-choice daily for two full weeks.
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I know that a lot of people on this site recommend Valzene wormer, rather than Wazine-17, which is primarily for roundworms. The Valzene is a more all-inclusive wormer, but I chose to use what my vet recommended, and it worked well for me.
Whatever you choose to do, I recommend that you take action quickly, before it gets out of hand, like I did! I might mention that someone on BYC forum also recommended putting cayenne pepper in your regular chicken feed for a natural way of worming the chickens. They recommended mixing it into the feed until the feed is 'rust-colored', and some also recommended mixing in fresh minced garlic as well. You use it one day, and then wait a few days, and do it again. Apparently, chickens don't have 'heat receptors', so the cayenne ingestion doesn't bother them. However, it is said that once the cayenne goes into the chickens, they can handle it, but the worms can't, and they die and come out in the poop.
I hope these suggestions help you. We are all in this together, for sure!