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Then I would definitely treat the entire flock.

How much of the flock are showing symptoms? If it's only one chicken, separate her and treat only her. If it's half the flock or more showing symptoms, treat the entire flock.

Those symptoms are typical of a respiratory infection. Many of these will resolve on their own, but if the symptoms worsen and the chickens become lethargic, an antibiotic may be necessary to combat a bacterial component of the infection. It's obtainable without a prescription here...