It normally only kills young chickens between weeks 3 - 8, and the coccidia cause the bird to bleed internally from the intestinal walls. So a really nasty, and painful disease. And it is not just a disease affecting chickens, but can also affect puppies as well.
Coccidia are very prolific parasites. A single sporulated oocyst can have a big impact when eaten by a chicken. Each oocyst has four sporocysts in it, and each sporocyst has two sporozoites in it. The digestive tract releases the eight sporozoites from the oocyst, and they move into the cell lining of the digestive tract. Inside the cell, the parasite divides and invades more cells. There may be several generations of asexual multiplication; however, this stage is self-limiting and eventually stops. Finally, a sexual stage occurs in which male and female organisms unite and form new oocysts that are protected by a thick wall. These oocysts are shed in the faeces.
If you find that the litter is very dirty, get rid of it and replace it with clean litter. This is important when you remember that the coccidia are present in chicken poop. It is also important to do so if you can smell ammonia in the shed, as this is coming from the chicken poop, indicative of too much poop and not enough litter and this will also cause respiratory problems in your birds.
Finally, in raising healthy chickens it is important that they receive a good balanced diet when you first get them. You will need a diet that will keep the gizzard healthy. Studies have shown that those chickens who were fed a good commercial chick ration had well-developed gizzards, which in turn reduced the numbers and the effects of coccidiosis later on. Wheat is an important factor in this, as is whey powder (which you can buy at health shops) and should be added to the chick started feed once or twice a week. I am also a firm fan of cider vinegar in the water which also aids the gut, and keeps disease down.
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