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There may be one or so, for example Infectious Bronchitis (IB) - birds can recover fairly quickly, but IB will make carriers of all chickens who recover for 5-12 months afterward, so don't hatch any eggs until 1 year later. IB does however cause reproductive disorders, so egg production is...

Respiratory illness are contagious. Chickens do not get colds. Regardless if a chicken recovers and shows no symptoms, they still are carriers. Other chickens exposed - even if they never show symptoms are still carriers. Bringing in new chickens or selling/giving away chicks, started...