Prevention and treatment of rotten swine intestinal fever

Swine rotten intestinal cholera, also known as swine cholera, is scientifically called "classical swine fever". It is a serious acute, febrile and contagious disease caused by classical swine fever virus. It is caused by elevated body temperature and missed heat. Eat little or no food, like to drink water, like to eat tender fodder; depressed spirit, arch back, shiver, lying on the ground do not want to move, squeeze each other or get into the bedding grass; feces are spherical or diarrhea, and constipation and diarrhea occur alternately; purple spots appear in the ears, neck, abdomen, limbs and so on. Rotten swine fever can occur all the year round, and pigs of different breeds, genders and ages are susceptible to infection.

1 characteristics of infection

The infection of swine rotten intestinal fever is generally due to the omission of epidemic prevention, drastic changes in climate, environmental changes, long-distance transportation, the introduction of off-site feeding of piglets is affected by the harsh environment, stress disorders are the most likely to cause the disease. Once infected, the infected pigs are the main source of infection for the spread, spread and spread of the disease. The specific modes of transmission are: (1) direct contact between healthy pigs and diseased pigs; (2) contamination of drinking water, sites, feed, utensils, etc. by saliva and other secretions of diseased pigs; (3) fecal and urine contamination of diseased pigs; C4) misconsumption of pork with classical swine fever virus; (5) feeding pigs with unboiled leftover vegetable soup. (6) buying, selling and transporting pigs without disinfection; (7) medical instruments injected with classical swine fever vaccine are reused without disinfection; (8) insects fly and crawl over contaminants and feces of infected pigs, then fly and crawl to come into contact with healthy pigs and their food products; (9) people and other animals bring the virus to the place where swine fever occurs and cause the occurrence and transmission of swine intestinal fever.

2 clinical symptoms

The incubation period of swine rotten intestinal fever is generally 2-8 days, but the incubation period of some infected pigs is longer. The symptoms can be divided into three types: the most acute, acute and chronic.

2.1 the pigs with the most acute disease died suddenly without obvious clinical symptoms.

2.2 the body temperature of pigs with acute disease increased to 40.5-42 ℃ and missed fever. The sick pig is in low spirits and often lies down. The pigs in the unpadded cottages are crowded with each other, and the pigs in the padded grass like to get into the bedding grass or lie in the corner of the wall. Conjunctival congestion, some eyelids have purulent secretions. At the beginning of the disease dry hard fecal ball, after diarrhea, or diarrhea and constipation occur alternately. Feces contain mucus or mucous membrane, some with blood. Purplish red spots gradually appeared in the ears, lower neck, abdomen and limbs, but some only appeared in the ears and lower hind limbs. This is a hemorrhagic purple spot peculiar to dominant porcine intestinal distemper.

2.3 the general incubation period of chronic type is 10 to 20 days before showing clear and dark clinical symptoms. There are also from acute to chronic, chronic pig intestinal plague has a long course of disease, sick pigs gradually lose weight, abnormal appetite, body temperature when high and sometimes low, sometimes normal. The tip of the ear is cold or slightly hot, shallow breathing, eye conjunctiva flushing or pale, slight shivering, trembling, arched back shrinking or inconspicuous, dull and unstable movement, stacked with each other or into the bedding grass. First constipation followed by dysentery or diarrhea followed by constipation, or diarrhea and constipation occurred alternately, feces with intestinal mucosa or not obvious, sick pigs have the characteristics of eating dirt, but some do not have this characteristic. There was no obvious change in the surface skin of recessive porcine intestinal distemper.

3 pathological changes

The whole body lymph node section shows red and white marble appearance, edge bleeding, section bulge, severe black-red; tonsil enlargement, severe hyperemia, congestion; laryngeal hemorrhage, oral mucous membrane necrosis; pericardium, heart surface has varying degrees of bleeding spots, endocardial congestion; spleen marginal infarction, there are needle-like bleeding spots on the surface. The kidney is pale, there are bleeding spots on the surface, there are bleeding spots in the renal cortex and medulla, there are button-shaped ulcers of varying sizes in the cecum and colon, and there are necrotic spots in the intestinal serosa; there are congestion spots at the bottom of the stomach; there are congestion spots on the skin and subcutaneous fat; some form red or purplish red bleeding spots in the ears, neck, abdomen and limbs, but some only appear cyanotic spots in the ears and the lower parts of the two hindlimbs.

4 prevention and control measures

The main results are as follows: (1) at present, there is no effective drug treatment for the disease, so it is necessary to do a good job in immunization and quarantine of swine rotten intestinal plague, to enhance the immunity of pigs to swine plague, and to deal with pigs with swine fever in time. It is an effective measure to prevent and cure the occurrence of swine intestinal plague.

(2) it is necessary to formulate an epidemic prevention plan, and conscientiously do a good job in regular immunization in spring and autumn and immunization of new pigs in peacetime, so as to put an end to late and missed immunity. The immunity was produced 4 days after classical swine fever vaccine vaccination, and the immune period was 1 year. It is best for piglets to be vaccinated after weaning. Vaccination during lactation is unreliable because suckling piglets are interfered with maternal antibodies.

(3) strengthen the feeding and management, do a good job in the cleanliness and hygiene of the enclosure, and at the same time improve the utensils and environmental hygiene, which is conducive to the healthy growth of pigs, so as to enhance the disease resistance of pigs.

(4) do a good job in regular disinfection and sterilization of enclosures, venues, appliances, rodents, mosquitoes and flies at any time.

(5) usually, piggery observation and quarantine should be done at any time, and problems should be dealt with in time, that is, isolation, observation, prevention and control, or (burning and burying) destruction.

(6) it is strictly forbidden for sick pigs to come into contact with healthy pigs or enter healthy pig houses, as well as other animals.

(7) all pens, mattresses, mattresses, feed troughs, feed, drinking water, sites and utensils contaminated by pigs should be strictly disinfected.

(8) the feces and urine excreted by diseased pigs should be collected for disinfection and fermentation.

(9) vehicles and personnel that buy, sell and transport pigs should be strictly disinfected.

(10) foreigners and animals are not allowed to enter pig farms and pens casually, so as to prevent the spread of epidemic diseases.