Sick Barred Rock

[Smoakhouse]

Does anyone have any information or photos of Infectious Coryza? She shows the symptoms, we have been giving her duramycin. How would this affect the flock? We are having to help her drink, her eyes are matted shut and swollen wattles, and nassel discharge. We have seperated her from the flock, but it came on fast. This is a new bird, the flock she came from seemed healthy.

 

[rooster-red]

Try this link, some info can be found here. http://www.merckvetmanual.com/mvm/index.jsp

 

[FractalFarmer]

We got some new point-of-lay hens and kept them isolated for a month. After we introduced them to our main flock, one of the new girls fell ill with what we think was coryza. She pulled through OK, but then one the other newly acquired hens started to get sneezy too (but never got as sick as the first one). None of our original flock was ever affected. I've considered the possibility that our flock may have been carriers who got infected from wild birds when they were very young and it wasn't serious, and the new girls caught it from them as adults and got a more serious case of it. So IMO, you should keep the sick bird isolated but consider the possibility that she may have caught this from your flock instead of being the vector.

More info I found:

Introduction

A usually acute, sometimes chronic, highly infectious disease of chickens, occasionally pheasants and guinea-fowl, characterised by catarrhal inflammation of the upper respiratory tract, especially nasal and sinus mucosae.

Infectious Coryza is caused by the bacterium Haemophilus paragallinarum and is seen in many countries especially in multi-age farms that are never depopulated. Morbidity is high but mortality low if uncomplicated although it may be up to 20%.

The route of infection is conjunctival or nasal with an incubation period of 1-3 days followed by rapid onset of disease over a 2-3 day period with the whole flock affected within 10 days, resulting in increased culling. Carriers are important with transmission via exudates and by direct contact. It is not egg transmitted.

The bacterium survives 2-3 days outside the bird but is easily killed by heat, drying and disinfectants. Intercurrent respiratory viral and bacterial infections are predisposing factors.
Signs

* Facial swelling.
* Purulent ocular and nasal discharge.
* Swollen wattles.
* Sneezing.
* Dyspnoea.
* Loss in condition.
* Drop in egg production of 10-40%.
* Inappetance.

...

Treatment

Streptomycin, Dihydrostreptomycin, sulphonamides, tylosin, erythromycin. Flouroquinolones are bactericidal and might prevent carriers.

There is also a bad smell to the mucous that is characteristic of this disease. Good luck!​