Streptococcus is a zoonotic infectious disease that is caused by various streptococci and is widely distributed. Due to the low temperature in winter, piglets often get together to warm up, which is more likely to cause mutual infection. Especially after the piglets are castrated, once the infection occurs, the morbidity and mortality are above 80%. Many manifestations are septicaemia and meningitis, which are harmful to the development of the pig industry. After infection, the piglet infects Streptococcus through the wound and often does not see any symptoms the day before. It died in the early morning of the next day. Or stop for a meal or two, body temperature 41.2 °C -42 ~ E or more, lying, the spirit of Weidun. There are purple spots under the abdomen and they often die. Acute cases are often depressed, with a body temperature of 41~E or so, showing heat retention, reducing or not eating, conjunctival flushing, frequent tremors, foamy liquids from the mouth and nose, individual fluids are slightly reddish, and later on the tip of the ear and lower extremities , purple or hemorrhagic erythema, the course of 2 days -4 days. Post-mortem autopsy, congestion of various organs, bleeding, increased pericardial fluid, splenomegaly 2 times -3 times, systemic lymph nodes, abdominal cavity, joint cavity accumulation of yellow liquid, etc.. For castration secondary streptococcal disease Piglets should first improve the feeding environment and clear the source of infection. Pigs raised at high density should be evacuated to reduce the rearing density so that each piglet occupies an area of ​​about 1.7m2. At the same time, 3% sura or 1/300 of the bacteriocins are used to thoroughly disinfect the contaminated equipment and environment daily. Once, until the epidemic stops. Followed by a large dose of Western medicine treatment. In particular, chloramphenicol treatment is better. The condition was given by intramuscular injection of chloramphenicol at a dose of 30 mg/kg body weight twice daily. At the same time add O. in the feed. 1% chlorine powder was given to large groups. It should also be noted that the wounds of piglets after castration must be disinfected with iodine, to strengthen the tube, avoid man-made results, at least to adhere to 5 days (a course of treatment).
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