sick chicken

[Ambiguity]

One of my chickens is acting peculiar. I caught one sneezing this morning and now she does not seem to be eating. She did not come for her evening treats. She seems to be going down the same path of the little peachick I lost last year. If she is not dead in the morning I was thinking of giving some Terramycin in the birds water. My main question is how long after that should I avoid eating the eggs of my chickens? Also is there anything else I should be giving her? I don't think I have a way to quarantine her in this cold weather, is it best to give it to all of my birds?
Thanks so much

 

[morelcabin]

I heard from a guy the other day that he uses cinnamon in his pigeon water, to stop colds in a hurry. Just put a teaspoon or two in the water for all of them. I used it last week on mine, and they all came through the -40 days okay