Given the inclination of backyard chicken keepers to add chickens to their existing flocks, also known as “chicken math,” it is extremely important that proper quarantine procedures are followed when bringing new flock members home. Failure to quarantine new flock members can- and often does- result in the death of an entire flock. 
To illustrate the importance of quarantine, a long-time Facebook follower, Melissa Stalpers, has graciously offered to share her story. This timeline documents the events leading up to the loss of her entire flock recently:
November 9: Melissa bought 3, six month old, healthy-looking, Cinnamon Queen chickens from a breeder through Craigslist. Unknowingly, she did not properly quarantine the new chickens from her existing flock of 42 chickens. (they were in a crate near her flock)
November 19: the new birds develop bubbly, clear fluid in their eyes and nostrils, breathing sounds rattly and they begin falling over. Within hours, 2 of the 3 new birds died. Melissa wrote to me on Facebook & I recommended that she obtain a necropsy of the deceased birds.
**Any time a sick chicken dies suspiciously, a necropsy of the deceased bird(s) should be performed. Information about obtaining a necropsy can be found HERE.
November 20th: third new bird died. First existing flock member developed the same symptoms the new birds exhibited.
November 30th: Five existing flock members have died. Bird sent to have necropsy performed.
December 6th: Veterinarian confirms mycoplasma gallisepticum (aka: MG, chronic respiratory disease, CRD). This highly contagious, respiratory disease was likely latent in the Cinnamon Queens and the stress of moving caused the disease to become active and spread. Remaining flock members were treated with Baytril, Cipro and eye drops to mitigate the symptoms, but would always remain carriers of MG.
By December 11: the entire flock of 42 birds had died and the family was distraught.
Again, many thanks to Melissa for sharing her story so that we can benefit from her experience.
WHAT IS QUARANTINE?
To quarantine means to completely isolate newly acquired birds from an existing flock for a significant period of time, during which they are observed for diseases and parasites.
WHY QUARANTINE?
A chicken can appear perfectly healthy while harboring problems (diseases and parasites) that may not be obvious initially. Quarantining provides an opportunity to watch for health dangers without risking the health of an existing flock. Moving chickens from one home to another is a major stressor, which can cause latent diseases to become active posing a health threat to other birds.
HOW TO QUARANTINE
Birds from different backyards, farms or facilities should be quarantined as long as possible in separate housing, away from the main flock; the bare minimum recommendation is two weeks, but 30-60 days is preferred. During the quarantine period, testing can be performed if desired (eg: fecal float testing for worms, bloodwork for other communicable diseases) and a lice or mite infestation can be identified and treated. Once the quarantine period is over and all the new birds still appear healthy, they can be integrated gradually into the existing flock.
QUALITY QUARANTINE = D.I.T.O.: Distance, Isolation, Time, Observation
Distance
Keep new birds at least 12 yards away from existing flock. Some diseases, such as mycoplasma gallisepticum, can travel in the air.
Isolation
Keep new birds confined and isolated in a dedicated pen or other suitable area. Don’t share equipment, clothes, shoes, feeders, waterers between the new birds & existing flock. For example: do not wear the same boots to feed the new birds and then walk to the existing flock in the same boots as many pathogens can be carried on clothes, equipment and shoes.
Time
The longer a bird is in quarantine, the greater the opportunity for diseases to manifest themselves and be detected. Three weeks is the bare minimum recommendation, but longer is better.
Observation
Observe new birds for signs of illness including: coughing, sneezing, gurgling, red, swollen or watery eyes, eye or nasal discharge, paralysis of legs and/or wings, discolored combs, wattles, drowsiness, depression, uncoordinated movements, lack of appetite, failure to drink and/or unusual droppings (bloody, worms, diarrhea). Never add birds with signs of disease to the flock.
After the quarantine period has expired and everyone checks out okay, the process of integration into the existing flock can begin. Learn how to go about introducing the newbies without bloodshed while minimizing stress in this article.
Kathy Shea Mormino
Affectionately known internationally as The Chicken Chick®, Kathy Shea Mormino shares a fun-loving, informative style to raising backyard chickens. …Read on
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Given the inclination of backyard chicken keepers to add chickens to their existing flocks, also known as “chicken math,” it is extremely important that proper quarantine procedures are followed when bringing new flock members home. Failure to quarantine new flock members can- and often does- result in the death of an entire flock.
To illustrate the importance of quarantine, a long-time Facebook follower, Melissa Stalpers, has graciously offered to share her story. This timeline documents the events leading up to the loss of her entire flock recently:
November 9: Melissa bought 3, six month old, healthy-looking, Cinnamon Queen chickens from a breeder through Craigslist. Unknowingly, she did not properly quarantine the new chickens from her existing flock of 42 chickens. (they were in a crate near her flock)
November 19: the new birds develop bubbly, clear fluid in their eyes and nostrils, breathing sounds rattly and they begin falling over. Within hours, 2 of the 3 new birds died. Melissa wrote to me on Facebook & I recommended that she obtain a necropsy of the deceased birds.
**Any time a sick chicken dies suspiciously, a necropsy of the deceased bird(s) should be performed. Information about obtaining a necropsy can be found HERE.
November 20th: third new bird died. First existing flock member developed the same symptoms the new birds exhibited.
November 30th: Five existing flock members have died. Bird sent to have necropsy performed.
December 6th: Veterinarian confirms mycoplasma gallisepticum (aka: MG, chronic respiratory disease, CRD). This highly contagious, respiratory disease was likely latent in the Cinnamon Queens and the stress of moving caused the disease to become active and spread. Remaining flock members were treated with Baytril, Cipro and eye drops to mitigate the symptoms, but would always remain carriers of MG.
By December 11: the entire flock of 42 birds had died and the family was distraught.
Again, many thanks to Melissa for sharing her story so that we can benefit from her experience.
WHAT IS QUARANTINE?
To quarantine means to completely isolate newly acquired birds from an existing flock for a significant period of time, during which they are observed for diseases and parasites.
WHY QUARANTINE?
A chicken can appear perfectly healthy while harboring problems (diseases and parasites) that may not be obvious initially. Quarantining provides an opportunity to watch for health dangers without risking the health of an existing flock. Moving chickens from one home to another is a major stressor, which can cause latent diseases to become active posing a health threat to other birds.
HOW TO QUARANTINE
Birds from different backyards, farms or facilities should be quarantined as long as possible in separate housing, away from the main flock; the bare minimum recommendation is two weeks, but 30-60 days is preferred. During the quarantine period, testing can be performed if desired (eg: fecal float testing for worms, bloodwork for other communicable diseases) and a lice or mite infestation can be identified and treated. Once the quarantine period is over and all the new birds still appear healthy, they can be integrated gradually into the existing flock.
QUALITY QUARANTINE = D.I.T.O.: Distance, Isolation, Time, Observation
Distance
Keep new birds at least 12 yards away from existing flock. Some diseases, such as mycoplasma gallisepticum, can travel in the air.
Isolation
Keep new birds confined and isolated in a dedicated pen or other suitable area. Don’t share equipment, clothes, shoes, feeders, waterers between the new birds & existing flock. For example: do not wear the same boots to feed the new birds and then walk to the existing flock in the same boots as many pathogens can be carried on clothes, equipment and shoes.
Time
The longer a bird is in quarantine, the greater the opportunity for diseases to manifest themselves and be detected. Three weeks is the bare minimum recommendation, but longer is better.
Observation
Observe new birds for signs of illness including: coughing, sneezing, gurgling, red, swollen or watery eyes, eye or nasal discharge, paralysis of legs and/or wings, discolored combs, wattles, drowsiness, depression, uncoordinated movements, lack of appetite, failure to drink and/or unusual droppings (bloody, worms, diarrhea). Never add birds with signs of disease to the flock.
After the quarantine period has expired and everyone checks out okay, the process of integration into the existing flock can begin. Learn how to go about introducing the newbies without bloodshed while minimizing stress in this article.
Thanks for your article, I learned the hard way. As a youth & into my 20's, I was passionate about showing chickens, it was my life!! I used to show at just two poultry shows every year, and I never quarantined when I got home because I didn't take it seriously. Once my flock picked up scaley leg mites from a show which I was able to eliminate with a -lot- of work, it could have been prevented if I had vaselined all of my birds legs when I got home. Still I kept showing without quarantining. The worst was… Read more »
I have a question, I have my first small flock on order I am getting special breads from a reputable place. I am getting 8 bantam types of chicks they do not vaccinate before shipping because of the small size of the babies. It is something that has worried me since placing my order. I live in NV what do I need to do on my part to keep them healthy besides medicated feed? I have been reading so much and learned so much this is one thing I haven't found munch info on.
This is the reason we bought eggs to incubate to add to our flock, rather than buy chickens.
These two articles should help you: https://the-chicken-chick.com/2013/04/when-to-move-chicks-from-brooder-to.html
https://the-chicken-chick.com/2011/06/integrating-new-flock-members-playpen.html
Now I understand the quarantine process, I did not know this. Now after the quarantine how do I introduce the new birds, I have baby chicks coming in a month, do they have to have their own coop until fully grown?? Thank you for all your informative info, I am a new chicken keeper and just seem to want more and more chickens!! :)