The swine fever is not unfamiliar to the majority of farmers, and is familiar with the general clinical symptoms of swine fever. However, the swine fever is still happening from time to time, and sometimes it has an outbreak! It is worth mentioning that the attenuated H5N1 vaccine currently used in China is a completely attenuated vaccine with no residual virulence recognized by the whole world. The swine fever in many countries in the world is through the use of Chinese swine fever vaccine. Can be controlled and eliminated, while the control of piglets in our country (including classical and mild type) still takes a long time. In many cases, the farmers are in full compliance with routine epidemic prevention procedures and standards for epidemic prevention. However, the effect is not satisfactory.
The current vicious cycle of swine fever
Self-producing and self-recovery farms: Poultry herds (boars and sows) - virulent infection of piglets through the placenta - congenital infection of immune tolerant pigs (injected vaccine without antibodies or antibodies) - persistent infection Pigs - reserve pigs reserved - with poisoned pigs (so circulating pigs cannot be controlled)
Non-self breeding pig farms: Outsourcing pigs are only positively infected pigs or pigs have contaminated the environment - leading to susceptible pigs - some of the pigs become reclusive of toxic pigs after rehabilitation - Detoxification Environmental Summary: Above The phenomenon shows that the breeding of pigs plays a very important role in the occurrence and infection of mild swine fever. Currently, pigs in many large-scale swine farms have mixed infections. A large part of the reasons are due to the unsatisfactory control of swine fever. of. The current situation in China is that there are too many free-range households, the breeding density is high, the concept of epidemic prevention is poor, the daily management is not in place, and the sick and dead pigs are handled improperly or do not do harmless treatment at all, resulting in scattered drugs.
Vaccine issues
1. The swine fever vaccine should use the products with reliable quality and high reputation. Some farmers use products without manufacturer's address and no production lot number, resulting in the occurrence of swine fever.
2. The freeze-dried vaccine for swine fever needs to be transported and stored at low temperatures in a cool, dark and dry place. Some vaccines have low or invalid titer of vaccine antigens due to improper handling during transportation and storage.
3. In practice, if the vaccine is found to be under vacuum (no negative pressure during dilution), it should be discarded and not discarded. All used vaccine bottles should be concentrated and burned together. Don't throw away the vaccine to avoid environmental pollution, leading to susceptible pigs. infection.
4. Inadequate immunization dose: Nowadays, the immunization dose of the attenuated swine plague vaccine in China has been increased to 400 rabbit body responses in foreign countries, which means that the immune dose is appropriately increased by 3-6 times. Practice has shown that it can help reduce the maternal source. Antibody interference and improve immune effects.
5. The immunocompetent effect of swine fever in Lianmiao is not good: due to the presence of components that interfere with the immunity of swine fever in the joint seedlings produced by some biological products factories, resulting in inaccurate immune effects of swine fever. Therefore, single seedlings should be used as much as possible, and joint seedlings must be used. The epidemic should make up for piglet seedlings.
Personnel technical aspects
1. Lax disinfection of equipment: Due to lack of disinfection concept, when disinfecting the equipment, the equipment was not disinfected as required. Some farms even rinse the syringes with boiling water only. (The correct method is to disassemble the syringes and needles that are to be used and cook them in boiling water for 30 minutes.) In order to avoid poisoning the device, one pig should be used for injection.
2. When 75% of the alcohol is used for local immunization during the immunization, the procedure is then omitted. In many farms, this procedure seems to be eliminated. Strict epidemic prevention during prevention will prevent future episodes.
3. The injection needle is also very important: Some veterinarians often use short and thick needles for injection convenience. The large and shallow needle holes, the vaccine injected into the subcutaneous fat layer, affect the body's absorption of the vaccine, but also easily cause the vaccine from the pinhole. The outflow reduced the effective immunization dose, resulting in ineffective immunization of some pigs. Should be the first production and production of sows, boars use 16*38 needles to inject, after all the injection check once again if found some pigs have significant liquid injection or blood flow should be supplemented once.
4. The effect of drugs on immunity: Most antibiotics will inhibit the proliferation of immune cells, so do not use antibiotics before and after 5-7 days of immunization. Such as sulfa drugs.
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