Chicken leukocyte protozoonosis is a parasitism characterized by anemia caused by living protozoa of Leukocyte protozoa parasitizing chicken red blood cells and monocytes. It is caused mainly by Leucococcus carinii and Leucocytozoon. Among them, Leucoccus leucocytophils is the most serious damage to the chicken industry. The disease can cause a large number of chicks to die, impeded the development of the chicken, anemia and egg production in chickens.

Chickens of all ages of the disease can be infected, and the mortality rate of chickens at 3-6 weeks of age is high. As the age increases, the morbidity and mortality gradually decrease. The chicks are mostly infected with acute infections, the body temperature of the diseased chickens is high, the spirits are depressed, and the body is full of force and drowsiness; the appetite is weak and even absent; the limbs are light, the walking is difficult, and the movement is disordered; the mucus is flown, and the mucous in the mouth is white and green. 12-14-day-old chicks died suddenly due to severe bleeding, hemoptysis and dyspnea, and the mortality rate was as high as 91%.

Chickens and chickens are often emaciated, anemic, cockscomb, and meaty, so the disease is also called "white crown disease." Chickens often squat, row white or green feces; growth retardation of chickens in the chicken; chickens reduce or stop production of eggs, soft shell eggs, shell eggs increase; later chickens will appear fleas, the mortality rate of 5% -30%.

In the necropsy chickens, visible systemic hemorrhage was observed. Subcutaneous and muscles, especially in the pectoral muscles and leg muscles, showed marked punctate or plaque-like hemorrhages. Extensive bleeding was also observed in each of the internal organs. Bleeding of internal organs, especially common in the lungs, kidneys and liver. Seriously, both sides of the lungs are full of blood; there is a large amount of blood around the kidneys, and even some or all of the kidneys are covered by blood clots. Mesentery, myocardium, pectoral muscle, or liver, spleen, pancreas, and other organs have grayish white nodules in which the proliferation of leukocyte protozoa schizonts is large or the size of miliary is clearly defined by the surrounding tissues.

The occurrence of the disease is closely related to the activities of phlegm and blood stasis. The cockroaches and cockroaches are the vectors of Leucococcus carinii and Leucocytozoon, which causes the disease to occur in a large number of warm seasons, and there are obvious seasonalities. When the general temperature is above 20°C, fleas and ticks multiply quickly and their activities are strong. The epidemic is serious. The southern regions of China mostly occurred in April-October, while the northern regions mostly occurred in July-September.

Prevention of the disease, control of cockroaches and cockroaches is the most important part, we must pay attention to three points: First, we must pay attention to a good chicken coop and the surrounding environment, remove the weeds, puddles, livestock and poultry excrement and pollution near the house. Objects, to reduce elk, breeding and hiding; Second, eel and eel breeding season, to the sheds equipped with fine-eye screens to prevent embarrassing, eel entering; Third, for the hen house and the surrounding environment, every 6-7 days, with 6%-7% of malathion solution or deltamethrin, valeric acid, cyanide ether and other insecticides are sprayed one time to kill insects such as cockroaches and cockroaches and cut off the route of transmission.

For diseased chickens, early treatment should be performed. Can be used in the kernel nostril 100 grams, 100 kg of spices, once every 3 days, withdrawal for 2 days, and then take 3 days; or use the ball Aunt 100 grams, water 150 kg, once every 3-5 days. Sulfa dimethoxypyrimidine, sulfaquinoxaline, pyrimethamine, compound chlordiazepoxide, globulin powder and other sulfa drugs and their compound preparations and clopidol and other drugs can also be used for treatment. It is best to use drugs that have not been used in the affected chicken farms or use two effective drugs at the same time to avoid drug resistance and affect the therapeutic effect.

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