Chicken Diseases and Treatments
Diseases can spread from wild birds and pests, so keep an eye out during your daily health checks for the symptoms listed below.

1. Avian Pox/Fowl Pox:

If you notice that your chickens develop white spots on their skin, scabby sores on their combs, white ulcers in their mouth or trachea, and their laying stops then you should grow concerned that your chickens are developing Fowl Pox.
There are treatment options for Fowl Pox. You can feed them soft food and give them a warm and dry place to try and recoup. With adequate care, there is a great chance that your birds can survive this illness.
Symptoms: White spots on skin; combs turn into scabby sores; white membrane and ulcers in mouth, on trachea; laying stops; all ages affected.
How contracted: Viral disease; mosquitoes, other chickens with pox and contaminated surfaces.
Treatment: Supportive care, warm dry quarters, soft food; many birds with good care will survive.
Vaccine available: Yes; recovered birds are immune and do not carry the disease.

2. Botulism:
Symptoms: Tremors quickly progressing to paralysis of body, including breathing; feathers pull out easily; death in a few hours.
How contracted: Caused by a bacterial byproduct and by eating or drinking botulism-infected food or water
Treatment: Antitoxin available from vet but expensive. If found early try 1 teaspoon Epsom salts dissolved in 1 ounce warm water dripped into crop several times a day.
Vaccine available: None; locate and remove source, usually decaying carcass, meat near water, or insects that fed on the meat or the water the carcass is in.

3. Infectious Bronchitis

This disease hits close to home because it wiped out half of our flock when we were new to raising chickens. You’ll recognize this disease when you begin to hear your chickens sneezing, snoring, and coughing. And then the drainage will begin to secrete from their nose and eyes.
Their laying will cease too. But the good news is you can get a vaccine to stop this disease from impacting your chickens.
However, if you decide against that then you will need to move quickly when seeing these signs. Infectious Bronchitis is a viral disease and will travel quickly through the air.
To treat Infectious Bronchitis, give your chickens a warm, dry place to recoup. I gave my birds a warm herb tea and fed them fresh herbs, which seemed to help.

http://www.agricinfo.com/2018/03/common-chicken-disease-and-treatment.html?m=0

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