Coccidiosis
Commonly known as cocci, this disease can wipe out the entire flock. This is a deadly disease that only needs 96 hours to destroy an entire flock. If the chickens are smaller, then the time can even be shorter. This is a protozoa parasitic disease and every chicken raiser should be aware of it.
The disease has several physical symptoms. The feathers of the chickens will look as if they have been ruffled and the chickens will sulk in the corner. Diarrhea and a clear liquid, not unlike vomit in humans, will leak from their beeks.
The parasites that cause the disease are found naturally in soil. They can be brought to the farm quite easily through soil carried on shoes and boots. For this reason, you must not only keep your coop clean, but also yourself whenever you plan on going near it.