Pig B encephalitis and its prevention and treatment method

Swine B encephalitis, referred to as "JE", is a zoonotic infection caused by mosquito bites carrying Japanese encephalitis virus (JEV), which can cause encephalitis in children. After the pregnant sow is infected, it can infect the fetus through the placenta vertical infection, causing miscarriage or delayed childbirth and reproductive failure, miscarriage, deformed fetus, weak babies and other reproductive disorders; young boars show orchitis, severe loss of ability to breed It has been eliminated; especially for the reserve breeders and sows. There is a lack of effective therapeutic drugs in the clinic. Therefore, in May, farmers should start the prevention of porcine encephalitis.

I. Epidemiology

Japanese encephalitis is a natural epidemic disease. Many animals can become the source of infection after infection. Pig infection is the most common. The disease is mainly transmitted by the bite of mosquitoes. The virus can multiply in the mosquitoes and can be passed over the winter and passed through the eggs, becoming the source of infected animals in the following year. Due to the spread of mosquitoes, the epidemic is closely related to the breeding and activities of mosquitoes. There is obvious seasonality, mainly in the hot season. The age of onset of pigs is related to sexual maturity, mostly around 6 months of age, which is characterized by infection rate. High, low incidence rate (20%-30%), low mortality rate; high incidence rate in new epidemic areas, serious illness, and gradually reduced year by year, and finally more asymptomatic pigs.

Second, clinical symptoms

The incubation period of artificial infection is generally 3 to 4 days.

The body temperature rises to 40 ~ 41 ° C, showing heat retention. Depressed, loss of appetite, increased appetite. Conjunctival flushing, and some visual impairment. The hind limbs of the sick pigs were mildly paralyzed, walking squats, joints swollen, and finally hind limbs paralyzed, and they fell to the ground and died.

When a pregnant sow is sick, a sudden abortion often occurs, giving birth to a stillbirth or mummies. Abortion occurs mostly in the late pregnancy, breast augmentation during abortion, milk outflow, common placenta stagnant, reddish brown or taupe mucus from the vagina. Some of the aborted fetuses have been mummified, and some died of systemic edema. Some piglets die after a few days of birth. Some piglets grow well.

After the onset of boars, it is characterized by orchitis. After high fever, one or both sides of the testicles are swollen, the scrotum is hot, and the finger testicles have pain. After a few days, the testicular swelling subsided, gradually shrinking and hardening, and losing the ability to breed and breed.

Third, prevention and treatment methods

1. Injecting vaccine

From the beginning of March to April and throughout the mosquito activity period, 6 to 7 months old reserve males and sows must be vaccinated twice for porcine Japanese encephalitis 4 weeks and 1 week before breeding (do not use inactivated vaccines) ), must not leak. Use live porcine encephalitis vaccine, add 1 ml of the special dilution to each head according to the bottle label, and add 1 ml of muscle to each pig after complete dissolution. The immune protection period is 12 months. Positive pig farm gilts and breeding boars can be boosted once every 20 to 30 days before breeding. At the same time, adding 1% of “Promoting No. 1” to the feed 10 days before and after the injection can enhance the immune effect of the vaccine.

2, strengthen feeding management

Do a good job in daily feeding management, especially to manage young animals that have not passed the JE epidemic season and animals imported from non-epidemic areas. Most of these animals are negative for JE and are very susceptible to infection. Once infected, viremia is quickly developed and becomes a source of infection. Especially for pigs, the feeding period is short and the herd is updated quickly. Therefore, vaccination should be completed before the epidemic of JE, and mosquito bites should be avoided as much as possible during the epidemic. Isolation and treatment immediately after the onset of the disease, doing good nursing work can reduce death and promote health.

3. Enhance specific resistance in pigs

In the hot season, due to the influence of heat stress, the body's own body resistance is low. Therefore, 0.5% of Odman A can be added to the feed to enhance the specific resistance of the pig and promote its healthy growth.

4, do a good job in disinfection, etc.

Regularly clean the sanitation in the farm and disinfect it 2 or 3 times a week. Timely clean up the manure and sewage in the farm, the manure should be piled up and fermented, and the manure drain and septic tank should be covered with cement cover. Small pig farms should transport the manure to the off-site for fermentation treatment. The free-range households should also pay attention to cleaning the pens and cleaning the manure in time to prevent excessive accumulation of urine. Pay attention to prevent flooding.

5, hanging gauze

After the mosquito activity is found, the screen window should be nailed in the pig pen, the gauze hanging on the door or the gauze door should be installed, and the external insecticide such as “mosquito net” should be sprayed in time. Before the gauze net, first apply the drugs to kill mosquitoes and flies in the pig house, and the small corners, wall cracks, ceiling voids, etc., which are not noticeable, should be sprayed into place.

In short, JE is also one of the major epidemics of pigs, and its outbreaks often bring huge economic losses to the pig industry. Therefore, farmers need to be highly valued.

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