What are the epidemic characteristics of swine fever? The difference between swine fever and swine f

Swine fever is an acute, contagious swine infectious diseaseIt is characterized by high fever, severe bleeding of internal organs, and high mortality, but there is no direct harm to humans

The disease only infects pigs under natural conditions, and pigs and wild boars of different ages, sexes, breeds, and breeds are susceptible and can occur all year round. Sick pigs are the main source of infection, sick pig excrement and secretions, sick and dead pigs and organs and corpses, blood, meat, internal organs, wastewater, waste material contaminated feed of sick pigs, drinking water can spread the virus, the spread of swine fever is mainly through contact, through the digestive tract infection. In addition, sows infected with diseased and attenuated strains can also infect the fetus vertically through the placenta, resulting in weak piglets, stillbirths, mummified fetuses, etc.

Pigs of different ages and breeds can be infected, and other animals are resistant. It can happen all year round. Sick pigs are the main source of infection, the virus with the mouth, eyes, nose secretions and urine, feces discharged, polluting the environment, susceptible pigs eat contaminated feed, drinking water or inhale toxic droplets and dust, can be infected with the disease.

Improper disposal of sick pig carcasses, lack of serious implementation of epidemic prevention measures, non-sterilization of needles used for epidemic prevention, inaccurate immunization (flying injections, etc.), lax transportation and disinfection, direct entry of purchased pigs without quarantine, and the spread of viruses by feeding staff or collective canteens eating diseased pork, etc., are all caused by swine fever.

The main reason for the occurrence. In addition, pigs that have been resistant to this disease and pigs in the incubation period are also detoxified and should be strictly isolated and prevented.

Swine fever is an acute, febrile and highly contagious infectious disease, which is mainly characterized by high temperature and microvascular degeneration that causes systemic hemorrhage, necrosis and infarction.

Swine fever only infects pigs under natural conditions, and pigs of different ages, sexes, breeds and wild boars are susceptible and can occur all year round. Sick pigs are the main source of infection, and swine fever is mainly transmitted through contact and through the digestive tract. The excrement and secretions of sick pigs, the organs and carcasses of sick and dead pigs, the blood, meat, internal organs, and waste water of slaughtered pigs, and contaminated feed and drinking water can all spread the virus.

In addition, diseased sows can also infect the fetus vertically through the placenta, resulting in weak fetuses, stillbirths, mummified fetuses, etc.

<>1. Swine fever: the incubation period is 5-7 days, the mortality rate is high, the body temperature of the sick pig reaches more than 40 after the onset of the disease, and there will be a dorsal arch, mouth drill grass nest silver traces, walking and swaying, etc., some sick pigs have diarrhea, constipation, and obvious needle-like red spots appear in the lower abdomen. 2. Swine flu:

The incubation period is 2-7 days, and the body temperature of the sick pig reaches more than 40 after the onset of the disease, and at the same time, there is loss of appetite, mental atrophy, mouth drilling, etc., but there are no needle-like red spots on the lower abdomen, and there will be no constipation.

1. The difference between swine fever and swine flu

1. Swine fever. 1) The incubation period is usually 5-7 days, after the onset of the disease, the sick pig will have a high fever (more than 40), and at the same time show back arch, mouth drill grass nest, walking and other behaviors.

2) Some sick pigs have eye feces in the corners of their eyes, or diarrhea, and then constipation, and obvious pinpoint-like red spots appear on the lower abdomen.

3) The mortality rate of this disease is high, and the sick pigs will be bedridden and die after a period of time.

2. Swine flu:

1) The incubation period is usually 2-7 days, after the onset of the disease, the sick pigs will have a high fever (more than 40), and at the same time show mental malaise, loss of appetite, mouth drilling, back arch and other conditions.

2) There are no needlepoint-like red spots on the lower abdomen of sick pigs, and there will be no eye feces and constipation.

2. What are the symptoms of swine fever?

1. The body temperature of the sick pig reaches more than 40, the high fever does not go away, the cold shiver, the spirit is depressed, the back is hunched, the appetite is decreased or abolished, the eyes are red (with eye sockets), the walk is shaky, and the grass is like to drill the haystack.

2. In the early stage of the disease, the feces of the sick pigs are relatively dry, and they begin to be loose in the later stage.

3. Urine accumulation in the foreskin of boars, purple or red bleeding spots (different sizes) appear on **, do not fade and wither when pressed, and bleeding spots will appear all over the body when the condition is severe, and often accompanied by coughing.

4. Some sick pigs showed neurological symptoms, such as spinning, spasms, sudden falling to the ground, and even sudden death.

5. When the first class of the sick pig is autopsied, punctate hemorrhage can be seen, the kidney, larynx, and bladder have needle-like and bleeding points (the size of a grain of rice, which does not fade during acupressure), the spleen has hemorrhagic infarction, and the ileocecal valve has a button-shaped ulcer.

1. Acute swine fever. The body temperature of the sick pig rises to 40-42, and the spirit is depressed, cold and drowsy; constipation at the beginning of the illness, followed by mushy or watery diarrhea mixed with blood, foul-smelling stools; conjunctivitis, unclean oral mucosa, ulcers or bleeding spots on the gums and lips and on the tongue; Later, there are bleeding spots or spots on the nose, lips, ears, feet, abdomen and medial abdomen. Bacterial infections are often secondary, often with pneumonia or necrotizing enteritis.

2. Chronic swine fever. The body temperature of sick pigs does not rise significantly; Anemia, emaciation and general weakness, the general course of the disease is more than a month, appetite is good and bad, constipation and diarrhea alternately occur at the tip of the ear, the root of the tail and the limbs** necrosis or detachment. Survivors of chronic swine fever are severely stunted and become stiff pigs.

3. Atypical swine fever. It is also known as subclinical swine fever. The clinical symptoms and anatomical lesions are atypical, the morbidity and mortality are significantly reduced, the course of the disease is significantly prolonged, the infection mortality rate of newborn piglets is high, and the large pigs can generally tolerate it; Pregnant sows are infected and aborted, fetal corpses, stillbirths and malformed fetuses.

4. Late-onset swine fever. It is the sequelae of congenital infection, the infected pig does not show symptoms for a period of time after birth, and after a few months, mild anorexia, inactivity, conjunctivitis, and hindquarters paralysis appear, but the body temperature is normal, and it can survive for about half a year before death. Pregnant sows infected with low-virulence swine fever virus can manifest as abortion, stillbirth, fetal necropsis, malformations, and tremor in weak piglets or healthy-looking piglets that have actually been infected.

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.

Swine fever symptoms: different degrees of bleeding from the whole body**, serous membranes, mucous membranes and internal organs. The lymph nodes of the whole body are swollen, juicy, congested, bleeding, purple-black in appearance, marble-like in section, pale in color in the kidneys, needle-tip to millet-shaped bleeding points in the cortex, and cold in the spleen, which is mostly seen at the edges, and small black and purple patches in color, and bleeding from the laryngeal mucosa and tonsils.

The bladder mucosa has scattered bleeding spots. The gastric and intestinal mucosa is catarrhally inflamed. A button-shaped ulcer forms at the ileocecal valve of the large intestine.

Swine fever symptoms**:

There are the most acute, acute, chronic, and mild types of swine fever.

At present, swine fever epidemics often show irregular regional sporadic pathogenesis with atypical pathogenesis, such as fever, depression, loss of appetite, cough, ataxia, conjunctivitis and diarrhea, perinatal death, stillbirth, and miscarriage. Moderately virulent and virulent infections have these symptoms and spread rapidly in pigs regardless of age.

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 with a high mortality rate.

The most acute type is less common, the body temperature of sick pigs rises, there are often no other symptoms, and death within 1 to 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.

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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.

Clinical symptoms of swine fever and the appearance of internal organs!

The incubation period of swine fever is generally 5 7 days, and the sick pigs have fever to 42, showing residual fever, chills, accumulation, conjunctivitis and canthal at the corner of the eye. Intestinal infections start with constipation followed by diarrhea. There are many small bleeding spots in the ears, limbs, chest and abdomen, buttocks and perineum**, and the acupressure does not fade.

After pregnant sows are infected with the virus, they can have abortions, stillbirths, mummies, and give birth to live babies with weak constitution and difficult to survive.

Mild swine fever (chronic type): the main manifestations are emaciation, anemia, general weakness, mild fever, constipation and diarrhea alternately, ** purple spots or necrosis, and the course of the disease can be up to 1 month. In recent years, it often occurs, the symptoms are mild, the pathological changes are atypical, the young pigs can be fatal, the big pigs can be tolerated, often do not attract people's attention, but long-term poison.

What are the symptoms of being infected with swine fever?