Paramyxovirus (Newcastle disease)
Newcastle disease is a high-incidence, high-exposure infectious disease, and chickens under the age of 70 are the most susceptible to infection. Also known as Asian chicken fever, it is divided into typical Newcastle disease and atypical Newcastle disease (because the application of the vaccine has certain antibodies in the body, which can resist the invasion of Newcastle disease virus to a certain extent, so most of the newcastle disease is now an atypical symptom)
Common causes of disease; 1. Free-range chicken households with a small number of farmers ignore the immunization of the Newcastle disease vaccine. 2. Large-scale breeding plant farmers overuse the strongly toxic Newcastle disease vaccine for young chickens. 3. Chickens that have been immunized against Newcastle disease vaccine many times, but for various reasons, the antibodies are low or the chickens are immunosuppressed.
Appearance of sick chickens; mental depression, high body temperature, increased drinking water, decreased appetite, and drained yellow, white, green, and thin stools. The crown is dark red, the oral fluid is effusion, the sac is swollen, the inverted mouth leaves mucus, shakes the head, and makes a clucking and clucking sound. Later, there will be neurological symptoms such as twisting the neck, turning in circles, and looking up. Atypical generally shows crest dysplasia, atrophy, and slow egg production.
Anatomy is generally realized; the mouth and pharynx are effusion, the larynx and tracheal mucosa have bloody mucus, the larynx has bleeding spots, the tracheal ring bleeds, the sac is filled with sour liquid gas, the contents of the stomach are green, the coronary fat is epicardial bleeding, 1/2 of the descending segment of the duodenum, 2 to 5 cm below the yolk pedicle, and the lymphatic follicles and other three lymphatic follicles corresponding to the two cecal tips and the ileum.
Prevention and control; after the onset of the disease, the sick chickens are isolated in large groups in time, the polluted sites and drinking water feeding utensils are thoroughly disinfected, and the dead chickens are burned or buried deeply. Atypical; viability peptide + new stream hate + phosphorus rod clear seven generations. Typical; Newcastle disease yolk antibody can be injected to control death, and then use a phosphorus rod to clear the seventh generation + new flow hate.