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Chickens are suseptible to many diseases including fungi, viruses, bacteria, and parasites (even ulcers and cancer). Below is a table listing the common diseases found in chickens.
| NAME |
CAUSED BY |
SYMPTOMS |
| Aspergillosis |
Fungi |
Rapid Death, Caused from Feeding Moldy Grain |
| Avian influenza (bird flu) |
Virus |
Rapid Death |
| Histomoniasis (Blackhead disease)
| Protozoal Parasite |
Mild Health Problems, yellow watery droppings, affects liver |
| Botulism |
Toxin |
Paralysis, From Contaminated Grain |
| Campylobacteriosis |
Tissue Injury in the Gut |
Blood in droppings |
| Coccidiosis |
Parasites |
No Symptoms in Chickens, Humans: Bloody Diarrhea |
| Colds |
Virus |
Fever, etc; No Cure |
| Crop Bound |
Improper Feeding |
Swollen Crop, Listless |
| Dermanyssus gallinae (Red mite) |
Parasite |
Blood Feeders, Attack at Night |
| Egg Bound |
Oversized Egg |
Listless; Can be Fatal |
| Fatty Liver Hemorrhagic Syndrome |
High-Energy Food |
Unexpected Death; Occurs Only in Hens |
| Fowl Cholera |
Bacteria |
Convulsions, Uncoordinated Fluttering, Stiffness, Rapid Breathing, Listlessness, Shivering, Huddling, Sudden Death |
| Fowl Pox |
Virus |
Causes Lesions on the Comb, Wattles, and Beak |
| Fowl Typhoid |
Bacteria |
Increased Mortality, Anorexia, a drop in egg production, a watery to mucoid yellow diarrhea, the birds are depressed with rapid breathing |
| Gallid Herpesvirus 1 or Infectious Laryngotracheitis |
Virus |
Coughing, Sneezing, Head Shaking, Lethargy, Discharge from the Eyes and Nostrils (Sometimes Bloody), Difficulty Breathing |
| Gapeworm (Syngamus Trachea)
| Worms |
Worms Clog and Obstruct the Airway |
| Infectious Bronchitis |
Virus |
Gasping, Coughing, Sneezing, Tracheal Râles, and Nasal Discharge |
| Infectious Bursal Disease (Gumboro) |
Virus |
Immunosuppression and Mortality Generally at 3 to 6 Weeks of Age |
| Infectious Coryza |
Bacteria |
Sneezing, Lacrimation, Swollen Face, Nasal Exudates, Lethargic, Ruffled Feathers, up to 50% Mortality |
| Lymphoid Leukosis |
Avian Leukosis Virus |
Tumors, Enlarged Liver |
| Marek's Disease |
Virus |
Difficulty Breathing, Eyes Turn Grey, Depression, Paralysis, and death in a Large Number of Birds (up to 80 percent). |
| Moniliasis (Yeast Infection or Thrush) |
Fungi |
Infections Range from Superficial Skin Infection to Life Threatening, Usually Immuno-compromised. |
| Newcastle Disease |
Virus |
Gasping, Coughing, Depression, Lack of Appetite, Drooping Wings, Paralysis, Swelling of the Eyes and Neck, Diarrhea, Misshapen, Rough or Thin Shelled Eggs, Reduced Egg Production. |
| Necrotic Enteritis |
Bacteria |
Depression, Ruffled Feathers, Inappetance, Closed Eyes, Immobility, Dark Coloured Diarrhea, Sudden Death in Good Condition |
| Psittacosis |
Bacteria |
Inflamed Eyes, Difficulty Breathing, Watery Droppings |
| Pullorum (Salmonella) |
Bacteria |
diarrhoea |
| Scaly Leg |
Parasites |
Raised or Protruding Scales |
| Squamous Cell Carcinoma |
Cancer |
Tumor, Lesion, or Ulcer |
| Tibial Dyschondroplasia |
Speed Growing |
Deformed Bone Development, Lameness, Death |
| Toxoplasmosis |
Protozoal Parasite |
cysts in Nervous and Muscle Tissue, Death |
| Ulcerative Enteritis |
Bacteria |
Lesions on the Liver, Death |
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