What does the term "late-stage invasive swine fever" mean?
The term "late-stage invasive swine fever"?
Swine fever in piglets born to sows infected with latent swine fever is called late-stage invasive swine fever. Everyone, please discuss this term.
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Late-stage invasive swine fever? First time I've heard of it.. pig farming
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I feel it would be more accurate to call it reproductive failure swine fever
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Try using serum from your own farm, there doesn't seem to be any good method!
--------------------------------------
It's also the first time I've heard this term
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Diagnosis and treatment practice of reproductive failure-type swine fever in pig disease treatment July 31, 2008 Thursday 02:43 PM 1 Incidence
In recent years, in disease prevention and treatment work, swine fever characterized by abortion, stillbirth and death of newborn piglets has been continuously discovered, and the harm is also great.
A pig farm in Tieling successively discovered the phenomenon of abortion, stillbirth and mass death of newborn piglets shortly after birth in first-parity and multiparous sows. The pig farm had used various antibiotics and sulfonamide drugs for treatment, all with no effect. It is understood that the pig farm continuously had outbreaks of swine fever, and it occurred more often in piglets and weaned piglet groups. Japanese encephalitis and porcine parvovirus infection had also occurred, and were brought under control by vaccination. According to incomplete statistics, during the outbreak period the pig farm had nearly 300 cases of abortion and stillbirth, accounting for 21.1% of the total number of piglets born. The mortality rate of newborn piglets was also as high as 16.6%.
From the occurrence and epidemic situation of the disease, abortion and stillbirth appeared in June and increased month by month. Pregnant sows rarely showed symptoms; some only showed slightly reduced appetite 2-3 days before farrowing, and recovered immediately after farrowing. There were few abortions and more stillbirths, characterized by late fetal death. The farrowing time was often prolonged by about 24 hours, and most were stillbirths; in severe cases the whole litter was stillborn. Some stillborn fetuses had become mummified, some were edematous, and some had epidermal hemorrhage.
Newborn piglets usually developed the disease 10-24 hours after birth, clinically showing listlessness, erect back hair, fear of cold, unwillingness to move; in severe cases, whole-body tremors, with dirty patch-like changes commonly seen on the ears and inner side of the abdomen. Some had yellow watery diarrhea, some vomited, and died within a few hours to 48 hours after onset.
2 Pathological changes
A total of 40 stillborn and dead piglets were necropsied, and the lesions were basically similar. Commonly seen were patchy congestion and petechial hemorrhage under the renal capsule surface (the small ones like needle tips, the large ones 1-2mm), severe hemorrhage in the renal pelvis and renal papillae; the spleen was not enlarged, with small mound-like petechial hemorrhages often on the surface, and hemorrhagic infarction with serrated protrusions at the spleen margin; systemic lymph nodes were enlarged and congested, dark red, with juicy cut surfaces, showing diffuse hemorrhage or peripheral hemorrhage, while the central part still had gray-white areas, forming a red-and-white marbled appearance, most obvious in the mesenteric lymph nodes; petechial hemorrhages were also commonly seen in the larynx and bladder mucosa; the lungs had petechiae and hemorrhagic patches; there was hemorrhage in the epicardium, especially in the left auricle and coronary sulcus; meningeal blood vessels were congested; in some cases there was hemorrhage under the liver capsule and in the parenchyma, the gallbladder was full, and there were petechial hemorrhages in the gallbladder mucosa; in some cases the gastric mucosa was congested and hemorrhagic, with mild to severe mucosal ulceration, more severe in the gastric fundus and pylorus; in some cases gelatinous edema appeared in the subcutaneous tissue of the head and neck and in the inguinal region; in some cases there was a large amount of pleural effusion and ascites in the thoracic and abdominal cavities, red and turbid.
3 Laboratory diagnosis
Blood examination showed that the white blood cell counts were all lower than the average value of normal pigs of the same age. Bacteriological examination of blood and lymph nodes was negative. Brucella rapid plate agglutination test showed no agglutination. Tissue compression smear swine fever fluorescent antibody examination showed bright green fluorescent plaques.
4 Prevention and control measures and effects
The above incidence situation, pathological changes and laboratory diagnosis results indicated that the sow reproductive failure was caused by swine fever virus. For this reason, in addition to strengthening isolation and disinfection treatment according to routine practice, the farm also adopted measures to strengthen the antibody level of sows. Sows were vaccinated with 4 doses of swine fever vaccine 2-3 weeks before mating, while feeding and management were strengthened. The use of medicated feed and vaccination with other vaccines was stopped, so that sows developed strong immunity before mating, in order to prevent infection during pregnancy. Since then, no reproductive failure occurred in the breeding sows.
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This is not studying pig diseases, but inventing names for pig diseases
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Thank you to the friend on floor 6 for providing the case
--------------------------------------
I remember this is in the infectious disease textbook. I don't really want to talk about this. It's really not easy to handle, very complicated. Why not simplify it a bit?
--------------------------------------
I don't know, sometimes different disease names can show one's level, right?
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This post was last edited by Jiaheren on 2009-11-26 17:28
Reply to 6#qdet
This case is very meaningful. "Sows were vaccinated with 4 doses of swine fever vaccine 2-3 weeks before mating" - we have always done it this way, but the effects vary. The difference is that all other vaccines were stopped. Could this be the key to the problem?
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I feel this was a measure taken for the cases at that time. If necessary, do it this way.
But after the disease has passed, this should no longer be done. It is better to follow the normal immunization program.
Do a good job with swine fever vaccination twice a year for sows, and pseudorabies 3-4 times a year. The sows will basically have no problems.
--------------------------------------
Late-stage invasive swine fever? First time I've heard of it.. pig farming
--------------------------------------
I feel it would be more accurate to call it reproductive failure swine fever
--------------------------------------
Try using serum from your own farm, there doesn't seem to be any good method!
--------------------------------------
It's also the first time I've heard this term
--------------------------------------
Diagnosis and treatment practice of reproductive failure-type swine fever in pig disease treatment July 31, 2008 Thursday 02:43 PM 1 Incidence
In recent years, in disease prevention and treatment work, swine fever characterized by abortion, stillbirth and death of newborn piglets has been continuously discovered, and the harm is also great.
A pig farm in Tieling successively discovered the phenomenon of abortion, stillbirth and mass death of newborn piglets shortly after birth in first-parity and multiparous sows. The pig farm had used various antibiotics and sulfonamide drugs for treatment, all with no effect. It is understood that the pig farm continuously had outbreaks of swine fever, and it occurred more often in piglets and weaned piglet groups. Japanese encephalitis and porcine parvovirus infection had also occurred, and were brought under control by vaccination. According to incomplete statistics, during the outbreak period the pig farm had nearly 300 cases of abortion and stillbirth, accounting for 21.1% of the total number of piglets born. The mortality rate of newborn piglets was also as high as 16.6%.
From the occurrence and epidemic situation of the disease, abortion and stillbirth appeared in June and increased month by month. Pregnant sows rarely showed symptoms; some only showed slightly reduced appetite 2-3 days before farrowing, and recovered immediately after farrowing. There were few abortions and more stillbirths, characterized by late fetal death. The farrowing time was often prolonged by about 24 hours, and most were stillbirths; in severe cases the whole litter was stillborn. Some stillborn fetuses had become mummified, some were edematous, and some had epidermal hemorrhage.
Newborn piglets usually developed the disease 10-24 hours after birth, clinically showing listlessness, erect back hair, fear of cold, unwillingness to move; in severe cases, whole-body tremors, with dirty patch-like changes commonly seen on the ears and inner side of the abdomen. Some had yellow watery diarrhea, some vomited, and died within a few hours to 48 hours after onset.
2 Pathological changes
A total of 40 stillborn and dead piglets were necropsied, and the lesions were basically similar. Commonly seen were patchy congestion and petechial hemorrhage under the renal capsule surface (the small ones like needle tips, the large ones 1-2mm), severe hemorrhage in the renal pelvis and renal papillae; the spleen was not enlarged, with small mound-like petechial hemorrhages often on the surface, and hemorrhagic infarction with serrated protrusions at the spleen margin; systemic lymph nodes were enlarged and congested, dark red, with juicy cut surfaces, showing diffuse hemorrhage or peripheral hemorrhage, while the central part still had gray-white areas, forming a red-and-white marbled appearance, most obvious in the mesenteric lymph nodes; petechial hemorrhages were also commonly seen in the larynx and bladder mucosa; the lungs had petechiae and hemorrhagic patches; there was hemorrhage in the epicardium, especially in the left auricle and coronary sulcus; meningeal blood vessels were congested; in some cases there was hemorrhage under the liver capsule and in the parenchyma, the gallbladder was full, and there were petechial hemorrhages in the gallbladder mucosa; in some cases the gastric mucosa was congested and hemorrhagic, with mild to severe mucosal ulceration, more severe in the gastric fundus and pylorus; in some cases gelatinous edema appeared in the subcutaneous tissue of the head and neck and in the inguinal region; in some cases there was a large amount of pleural effusion and ascites in the thoracic and abdominal cavities, red and turbid.
3 Laboratory diagnosis
Blood examination showed that the white blood cell counts were all lower than the average value of normal pigs of the same age. Bacteriological examination of blood and lymph nodes was negative. Brucella rapid plate agglutination test showed no agglutination. Tissue compression smear swine fever fluorescent antibody examination showed bright green fluorescent plaques.
4 Prevention and control measures and effects
The above incidence situation, pathological changes and laboratory diagnosis results indicated that the sow reproductive failure was caused by swine fever virus. For this reason, in addition to strengthening isolation and disinfection treatment according to routine practice, the farm also adopted measures to strengthen the antibody level of sows. Sows were vaccinated with 4 doses of swine fever vaccine 2-3 weeks before mating, while feeding and management were strengthened. The use of medicated feed and vaccination with other vaccines was stopped, so that sows developed strong immunity before mating, in order to prevent infection during pregnancy. Since then, no reproductive failure occurred in the breeding sows.
--------------------------------------
This is not studying pig diseases, but inventing names for pig diseases
--------------------------------------
Thank you to the friend on floor 6 for providing the case
--------------------------------------
I remember this is in the infectious disease textbook. I don't really want to talk about this. It's really not easy to handle, very complicated. Why not simplify it a bit?
--------------------------------------
I don't know, sometimes different disease names can show one's level, right?
--------------------------------------
This post was last edited by Jiaheren on 2009-11-26 17:28
Reply to 6#qdet
This case is very meaningful. "Sows were vaccinated with 4 doses of swine fever vaccine 2-3 weeks before mating" - we have always done it this way, but the effects vary. The difference is that all other vaccines were stopped. Could this be the key to the problem?
--------------------------------------
I feel this was a measure taken for the cases at that time. If necessary, do it this way.
But after the disease has passed, this should no longer be done. It is better to follow the normal immunization program.
Do a good job with swine fever vaccination twice a year for sows, and pseudorabies 3-4 times a year. The sows will basically have no problems.