What does swine fever look like ? What is swine fever What is swine fever

Swine fever is an acute, febrile and highly contagious infectious disease caused by the swine fever virus. It is characterized by clinical symptoms of sepsis and pathological changes such as hemorrhage, necrosis and infarction caused by degeneration of small blood vessels.

Swine fever, also known as "rotten intestinal plague", is highly contagious, with high morbidity and mortality. At present, due to the widespread use of swine fever rabbit attenuated vaccine, the epidemic of swine fever has been basically controlled nationwide.

The virus is present in various tissues, organs and blood of sick pigs. This virus is very virulent, the serum of sick pigs is diluted 6 million times, and 1 ml of artificial inoculation can make healthy pigs sick. Swine fever virus is sensitive to dryness and spoilage, and is not very resistant to heat, and can be lethal at 78.

The disinfectants that are effective for this virus are 5% 10% bleaching powder, 2% 4% caustic soda solution and 20% quicklime milk, and the swine fever virus is resistant to lysol and carbolic acid. In nature, only pigs are infected with the disease. Pigs of different breeds, ages, and sexes are highly susceptible.

There is no significant seasonality in the prevalence of the disease. Sick pigs are the main source of infection of the disease, and the virus is excreted with feces, urine, secretions, saliva, etc. Resistant to healing pigs 24 to 57 days can still be detoxified.

Naturally, the disease is mainly transmitted through the digestive tract, so contaminated feed, drinking water, venues and utensils can spread the disease, followed by respiratory tract, conjunctiva and wounds.

Swine fever doesn't look like it, swine fever is just a virus. Satisfied.

Things you need to know about swine fever

1. Swine fever (infection with classical swine fever virus, CSF) is a highly acute, febrile and contact infectious disease caused by swine fever virus (CSFV) and occurs in pigs. The disease is divided into the most acute, acute, subacute, chronic, and mild types. The disease is characterized by acute onset, hyperthermia and degeneration of the walls of small vessels, generalized punctate hemorrhage, and splenic infarction.

2. Pig plague is widespread, with a high rate of madness and mortality; The main routes of transmission are the digestive and respiratory tracts; After the sow is infected, the fetus is infected vertically through the placenta. The disease is endemic throughout the year and can be devastating to the pig industry, making it one of the most serious infectious diseases that endanger the pig industry.

<> swine fever is an acute, febrile and contact infectious disease caused by the swine fever virus of the genus Swine Fever Virus of the Flaviviridae family. It first appeared in the United States in 1885, and later spread to all continents of the world, including most provinces in China.

Since the outbreak of African swine fever, the national pig price is still the best, many citizens have said that they can't afford to eat pork, and the losses caused by swine fever are relatively large. That you knowHow did swine fever come about? What are the implications?

How did swine fever come about?

Swine fever is caused by the swine fever virus of the genus Swine Fever Virus in the Flaviviridae family, which is transmitted by contact under natural conditions. Both wild boars and domestic pigs are very susceptible to infection due to contact sources such as food, sick pigs, and drinking water.

What are the effects of swine fever?

1.Pig prices. At present, the biggest impact of swine fever on the market must be the fluctuation of pork **, and for farmers, there are not a few who lose money. For those who sell pork, it's not much better, and it's harder to sell than before.

2.Consumer.

The impact of swine fever, the decrease in pig production, the shortage of pork, led to an increase in consumer spending.

3.Hog market.

The blockade orders in various places not only affect the inter-provincial transfer of pigs, but also directly affect the inter-provincial business of pig breeding enterprises. If some provinces prohibit inter-provincial transportation due to administrative orders, major pig breeding enterprises will be forced to adjust their corporate planning, either to sell pig seedlings within the province, or to change to self-breeding.

4.Pig feed backlog.

However, for the sale of feed merchants can not do business well, pig feed no one buys, and they do not buy, only open the door every day to make a look, some local customs are most afraid of closing. So there is no way to do it, and there are many businesses of the feed are on credit to the farmers, since the farmers do not raise pigs or raise losses, then the feed money can only be owed, anyway, no one is happy.

Therefore, whether it is common swine fever or African swine fever, the negative impact on consumers, farmers and the pork market is very large.

<> swine fever was first discovered in Ohio, USA, in 1833, and has spread around the world for more than 100 years through the transportation of multi-skinned species. The International Bureau of Animal Epidemiology (OIE) has designated swine fever as a Class A infectious disease, and China's Animal Epidemic Prevention Law has listed swine fever as a Class I infectious disease, which is one of the main diseases that currently endanger the development of China's Lingqiao pig industry. Burning Tomb.

Swine fever. Colloquial name"Celebration of rotten intestinal plague"It is a highly contagious disease and is one of the main infectious diseases that threaten the pig industry, characterized by: acute, septic changes, hemorrhage of parenchymal organs, necrosis and infarction; Chronic fibrinous necrotizing enteritis, often secondary to paratyphoid fever and Pasteur hand bacillosis in the later stages.

Swine fever is an acute contact infectious disease of pigs, also known as swine cholera. It was first discovered in the United States in 1885 and has since spread to all continents of the world. In 1903, American veterinarians De Heinez and Dorset identified the causative agent of the disease as the swine fever virus in the genus Pestivirus of the family Phiviridae.

Swine fever develops mainly through direct contact or through contact with contaminated vectors. The digestive tract, nasal mucosa, and ruptured ** are all routes of infection. It can occur all year round, especially in the rainy season of spring and summer.

Artificially inoculated pigs generally have an increase in body temperature after 36 to 48 hours. The incubation period for natural infection is usually 3 to 6 days, with occasional extensions to 24 days. Typical cases present with the most acute, subacute, or chronic course and mortality.

High. The most acute type is rare, the body temperature of sick pigs rises, there are often no other symptoms, and death within 1 or 2 days. The acute form is the most common, the body temperature can rise above 41, appetite is lost or absent, ocular conjunctivitis may occur with purulent discharge, purulent mucus often discharges from the nasal cavity, vomiting occasionally, and sometimes blood in the excretion, or even blood in the stool.

In the initial stage, there are often many punctate hemorrhages or large red spots on the root of the ear, abdomen, and medial thigh. The course of the disease is generally 1 to 2 weeks, and the vast majority of deaths are made at the end. The subacute form is common in endemic areas and can last up to 2 to 3 weeks; Some become chronic, often delayed for 1 to 2 months.

Presents with pale mucous membranes and bleeding spots on the eyelids.

**Purple spots appear, and the sick pigs are extremely emaciated. Death is mostly in piglets, and some adult pigs can endure it. The clinical symptoms of atypical pigs are not obvious, they are chronic, and they are common in "shelf pigs".

At the time of autopsy, the acute type is dominated by hemorrhagic lesions, and small spots of bleeding in the renal cortex and bladder mucosa are common; Mesentery.

Swollen lymph nodes, often with hemorrhagic enteritis, in the form of button-shaped ulcers in the mucosa of the large intestine.

is typical. <>

Chinese name. Swine fever.

Aetiology. Swine fever virus.

Alias. Porcine cholera.

What are the symptoms of being infected with swine fever?

What are the clinical symptoms and pathological changes of acute swine fever? Let's learn.

Once the disease is introduced into the susceptible pig herd, only a few pigs suddenly become ill and die at the beginning, and then the number of the disease increases, and it can quickly spread to the whole herd within 1 3 days, most of which are acute cases, and finally subacute and a few chronic cases appear, and the mortality rate is extremely high.

The length of the incubation period of the disease is related to the virulence of the virus and the resistance of pigs, generally 5 6 days, the shortest 2 days, and some as long as 21 days, which are generally divided into three kinds according to the length of the disease: the most acute, acute and chronic.

1) The most acute type is rare, and the pigs have a sudden onset, mainly manifested as high fever, loss of appetite, mucosal congestion, weakness, and death soon.

2) The acute type is the most common, and the body temperature of sick pigs rises to. Sick pigs are mentally depressed, coarse coat, shivering, liking, walking slowly and weakly, loss of appetite, increased drinking water, occasional vomiting, initial constipation, diarrhea, foul-smelling loose stools, red spots or red spots of different sizes appear in thin hair and skin behind the ears of sick pigs, abdomen, inner limbs, etc., boar foreskin is inflamed, and piglets have neurological symptoms.

3) The chronic type is mostly transformed from pigs with acute diseases. Loss of appetite, constipation alternates with diarrhea. The sick pig was emaciated, mentally depressed, weak in hindquarters, staggered in walking, and finally died of exhaustion.

In addition, in recent years, there have been mild swine fever occurrences, mild swine fever is caused by the weak virulence of the swine fever virus strain, characterized by a long incubation period and course of disease, low-grade fever, respiratory and neurological symptoms, morbidity and mortality are low, adult pigs are pluripotent **, and piglets have a higher mortality rate.