Prevention and treatment of wild boar swine fever in wild boar farming

Classical swine fever, also known as swine cholera, commonly known as intestinal rotting fever, is an acute, febrile and contagious disease caused by classical swine fever virus, which is mainly transmitted through the digestive tract. Pigs of different ages can occur all the year round. Classical swine fever virus has a strong resistance to the outside world. People and animals who come into contact with diseased pigs and a variety of appliances, feed, drinking water and so on can spread the disease.

1. Symptoms of wild boar classical swine fever in clinic, classical swine fever can be divided into acute and chronic. Atypical swine fever is common. The main results are as follows: (1) the body temperature is generally raised to 40.5-41.5 ℃, and any antibiotics are ineffective. (2) the appetite decreased significantly, and even abandoned food. Often feel thirsty at the beginning of the disease, often go to the trough when feeding, eat one or two mouthfuls, and then walk away slowly. (3) even in warm weather, sick pigs like to stack or embedded in human mattress, making a hoarse moan when lying still. (4) the diseased pig eyes often have purulent secretions, even adhesion of the upper and lower eyelids, wavering gait and imbalance. (5) bleeding spots and mucosal cyanosis can be seen in the ear tip, medial extremities, tail root, vulva or prepuce of diseased pigs.

2. The autopsy of wild boar swine fever (1) is characterized by bleeding, which is most common in the kidney and lymph nodes. The kidney is pale with needle-like bleeding spots on the surface and section, bleeding at the edge of the whole body lymph nodes (especially mesenteric lymph nodes), and the section is red and inlaid with marbling. Bleeding spots can sometimes be seen in other organs such as bladder, heart, throat, stomach and gallbladder. Bladder bleeding is more common in clinic. (2) the formation of splenic infarction is the most specific lesion of classical swine fever, that is, blisters of different sizes are often formed at the edge and tip of the spleen, black, shaped like steel wire serrated. (3) the pathological changes of the large intestine are characterized by button-shaped ulcers, which often occur in the early segment of the colon, with round ulcers, protuberant edges, and sediment adhered to in the middle depression, showing a concentric circle.

3. Prevention of wild boar swine fever (1) conscientiously implement the policy that prevention is more important than cure, and injecting attenuated vaccine against swine fever according to the procedure is the most effective way to prevent the occurrence of classical swine fever. During epidemic prevention, attention should be paid to the quality of the vaccine, syringes and needles should be strictly disinfected to achieve one needle per pig, at least one round. Sick pigs cannot be vaccinated. (2) to prevent the spread of the epidemic, we must not kill sick pigs casually, do not litter the droppings of sick and dead pigs everywhere, do not eat sick and dead pork, and so on. Pig farms must be self-breeding, implement strict quarantine system for pigs in and out, and do a good job in feeding management and environmental hygiene. For the pig farms where classical swine fever occurs, the following measures should be taken: first, immediately vaccinate the healthy pigs in the infected pig farms and the infected or threatened pigs with the attenuated vaccine of swine fever. Second, sick pigs should be buried deeply, and suspicious pigs should be isolated and observed in time, raised by special personnel, and the utensils and feed of sick pigs and healthy pigs should be separated and strictly disinfected. Third, the feces and urine of sick pigs should be centrally stored and fermented and generally closed for about 20 days before they can be used. Fourth, pig food and utensils used by diseased pigs, and aisles and sites contaminated with diseased pig feces and urine shall be disinfected with caustic soda or 5% lime milk containing 1% or 2%.

4. There are no effective drugs and methods for the treatment and disinfection of wild boar swine fever at present. Commonly used disinfectants are 1% 2% caustic soda, 5% bleach powder, etc., and 5% lime milk containing 1% 2% caustic soda has the best effect.