Need advise on rattled breath sneezing chicken
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Separating her was a wise decision.
There are several respiratory illnesses that can cause rattled breathing. Most illnesses can go into "remission" but the affected bird is usually a carrier for life. The illness can be shed in the dust, dander and feathers of the chicken. When stressed, the illness can become symptomatic again as you have found.
As far as exposure, to what she has time will tell.
When adding new chickens to your flock/property as a general rule it is best to have a quarantine period so you can observe them to see if they are bringing any illness, lice/mites or worms.
It may be hard to introduce your lone chicken to several members that have been together for a while. If you want to try integrating again, you may want to look up articles/threads about flock integration and use a "see-but-don't-touch"method, this may help reduced stress for all concerned.
Here is a list of common poultry diseases:
- Monkey Lookout
Great advice / observations from Wyorp. These links on integration may be useful, but personally, i would get rid of the lone chicken and hope that the newbies did not contract whatever respiratory problem the lone bird has (based on my experience)