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At least 343 records · Page 19Linked to original sources
PubMed1990

Efficacy of a cell extract from Actinobacillus (Haemophilus) pleuropneumoniae serotype 1 against disease in swine.

We partially characterized a cell extract (CE) from Actinobacillus pleuropneumoniae serotype 1 and used the CE to test the efficacy of secreted proteins against disease. Secreted products from 4-h culture supernatants were precipitated with 20% polyethylene glycol. Analysis of the CE indicated the presence of protein, endotoxin, and carbohydrate. Hemolytic activity to bovine erythrocytes and cytotoxic activity to porcine mononuclear leukocytes was also demonstrated. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis of the CE from a 4-h culture showed a major band at 110 kilodaltons (kDa), while a CE of a 26-h culture indicated the presence of a number of additional proteins, including the 110-kDa protein. The 110-kDa protein was also identified as a glycoprotein by periodic acid-Schiff and silver staining. A single band precipitated against convalescent-phase pig antiserum when the polyethylene glycol precipitate was used in an Ouchterlony plate. Vaccination with CE conferred greater protection against challenge with the homologous serotype than either a commercial bacterin or an outer membrane protein vaccine. Hemolysin-neutralizing titers were higher both pre- and postchallenge in the group vaccinated with the CE compared with in all other groups. We believe that this demonstrates the importance of secreted factors in protection against disease and suggests that the 110-kDa protein is an important immunogen.

Actinobacillus↗
PubMed2004

Efficacy of vaccines against bacterial diseases in swine: what can we expect?

This paper discusses what can be expected with regard to efficacy of antibacterial vaccines used in swine, based on the present knowledge of pathogen-host interactions. First, vaccination against bacteria that mainly cause disease by production of exotoxins is considered. Vaccines containing the inactivated toxin or a non-toxic but antigenic recombinant protein derived from the exotoxin can be expected to provide protection against disease. The degree of protection induced by such vaccines varies, however, depending amongst other things on the pathogenesis of the disease. Vaccination against clostridial infections, Actinobacillus pleuropneumoniae infections, progressive atrophic rhinitis and enterotoxigenic Escherichia coli, is considered. The second part of the article deals with vaccination against extracellular bacteria. Protection against these bacteria is generally mediated by antibodies against their surface antigens and certain secreted antigens, but cellular immunity may also play a role. Efficacy of vaccines against swine erysipelas, Streptococcus suis infections, Mycoplasma hyopneumoniae infections and swine dysentery is discussed. Finally, vaccination against facultatively intracellular bacteria is considered. For protection against these bacteria cell-mediated immunity plays an important role, but antibodies may also be involved. It is generally accepted that live-attenuated vaccines are more suitable for induction of cell-mediated immunity than inactivated vaccines, although this also depends on the adjuvant used in the vaccine. As an example, vaccination against Salmonella enterica serotype Typhimurium is discussed.

Animals↗
PubMed2002

Effective synthetic peptide vaccine for foot-and-mouth disease in swine.

We have designed a peptide-based vaccine for foot-and-mouth disease (FMD) effective in swine. The peptide immunogen has a G-H loop domain from the VP1 capsid protein of foot-and-mouth disease virus (FMDV) and a novel promiscuous T helper (Th) site for broad immunogenicity in multiple species. The G-H loop VP1 site was optimised for cross-reactivity to FMDV by the inclusion into the peptide of cyclic constraint and adjoining sequences. The incorporation of consensus residues into the hypervariable positions of the VP1 site provided for broad immunogenicity. The vaccine protected 20 out of 21 immunised pigs from infectious challenge by FMDV O1 Taiwan using peptide doses as low as 12.5 microg, and a mild adjuvant that caused no lesions. A safe chemically-defined product would have considerable advantages for vaccination against FMD.

Amino Acid Sequence↗
PubMed1993

[The effect of food medication alone or in combination with PGF2 alpha on the reproductive performance of swine with SUGD (swine urogenital disease)].

In a large pig production unit 60 postparturient sows were divided at random into 3 groups, each with 20 sows. Group 1 (20 sows) received 30 g Farmavet Trisulfa per os daily from the beginning of the postfarrowing period for 1 week. Group 2 (20 sows) received 30 g Farmavet Trisulfa per os daily from the beginning of the postfarrowing period for 1 week, and in addition were given 3 mg Gabbrostim 24-48 hours after farrowing in a single i.m. application. Group 3 (20 sows) untreated control. The following parameters were evaluated: A: number of weaned piglets per sow, B: weaning to service interval in days, C: return to oestrus in percent. Both groups 1 and 2 showed better results when compared to the control group. Group 2 was superior to group 1.

Administration, Oral↗
PubMed1999

Mapping the genetic determinants of pathogenicity and plaque phenotype in swine vesicular disease virus.

A series of recombinant viruses were constructed using infectious cDNA clones of the virulent J1'73 (large plaque phenotype) and the avirulent H/3'76 (small plaque phenotype) strains of swine vesicular disease virus to identify the genetic determinants of pathogenicity and plaque phenotype. Both traits could be mapped to the region between nucleotides (nt) 2233 and 3368 corresponding to the C terminus of VP3, the whole of VP1, and the N terminus of 2A. In this region, there are eight nucleotide differences leading to amino acid changes between the J1'73 and the H/3'76 strains. Site-directed mutagenesis of individual nucleotides from the virulent to the avirulent genotype and vice versa indicated that A at nt 2832, encoding glycine at VP1-132, and G at nt 3355, encoding arginine at 2APRO-20, correlated with a large-plaque phenotype and virulence in pigs, irrespective of the origin of the remainder of the genome. Of these two sites, 2APRO-20 appeared to be the dominant determinant for the large-plaque phenotype but further studies are required to elucidate their relative importance for virulence in pigs.

Animals↗
PubMed1982

Streptococcus suis type II-associated diseases in swine: observations of a one-year study.

Streptococcus suis type II was isolated from 170 pigs submitted to a veterinary diagnostic laboratory in Ontario, Canada, over a 1-year period. The most common disease condition with which the organism was identified was suppurative bronchopneumonia, usually secondary to enzootic pneumonia of pigs. The organism was also isolated in cases of pleuropneumonia, valvular endocarditis, arthritis, and vaginitis as well as from aborted fetuses. A condition characterized by neonatal disease and rapid death, usually within the first 24 hours of life, was identified in 23 pigs from 5 farms. Meningitis was identified in 15 weaned pigs from 8 farms. All S suis type II isolates tested for antimicrobial sensitivity were sensitive to penicillin and ampicillin. Most isolates were also sensitive to chloramphenicol and trimethoprim-sulfamethoxazole, but resistant to streptomycin and tetracycline. Accessions from which the organism was isolated were concentrated in the colder months of the year, with few or no isolates recorded in the summer months.

Animals↗
PubMed1975

[Estimation of pathomorphological and histochemical changes in the liver of pigs in the course of edema disease of swine].

Post-mortem examinations concerned 16 pigs which had died of the oedema disease. A group of 8 healthy pigs were slaughtered at the Lublin abattoir and used as controls. All animals were subjected to detailed autopsy, and sections of the liver were taken for histological examination. The fixed material was cut into sections by the paraffin and refrigeration methods. To the routine staining with haematoxylin and eosin, colour reactions were added to reveal glycogen, simple fats and acid and alkaline phosphatase. The macro- and microscopic examinations demonstrated chronic, focal inflammation of the liver capsule connected with liver cirrhosis. Hyperaemia of the liver was noticed in all cases. A decrease of glycogen, associated with progressive fatty infiltration of the liver cells, was observed in the diseased pigs in contrast to the control group. An increase of the activity of hydrolytic enzymes and a positive reaction to cholesterol compounds are symptoms of progressive catabolic changes in the liver cells.

Acid Phosphatase↗