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[Disorders in slaughtering animals. V. Endocarditis in slaughtering pigs, sows and cattle].

Bacteriological studies were done in 673 slaughtered animals (pigs, sows and cattle) in which post-mortem examination had revealed the presence of endocarditis. The studies were positive for the presence of bacteria in 453 cases. Lesions were not observed on ante-mortem inspection in 386 cases. Isolation of Corynebacterium pyogenes was extremely common in cattle, whereas beta-haemolytic streptococci and Erysipelothrix insidiosa were very frequently isolated in slaughtered pigs.

Animals↗

In vitro effect of combinations of antimicrobial agents and EDTA-tromethamine on certain gram-positive bacteria.

Combinations of EDTA-tromethamine and 7 antimicrobial agents (chloramphenicol, nalidixic acid, oxytetracycline, penicillin, polymyxin-B, streptomycin, and a triple sulfonamide preparation) were tested for synergistic activities against Staphylococcus aureus, Corynebacterium renal, Listeria monocytogenes, Erysipelothrix rhusiopathiae, and a beta-hemolytic streptococci. Two in vitro tests were used--minimal inhibitory concentrations of the drugs and a 2-dimensional Microtiter checkerboard technique. A slight synergistic action was seen when L monocytogenes was exposed to combinations of penicillin-EDTA or streptomycin-EDTA.

Anti-Bacterial Agents↗

[Pharmacological, toxicological, microbiological and pathohistological studies of gentamycin complex II].

The acute toxicity was determined of the gentamycin complex II (GMC-II) for albino mice, containing gentamycin components in a varying ratio. The LD50 at intraperitoneal application was 347.7 mg/kg body mass, while at oral application it was 5,180 mg (4933 divided by 5439) mg/kg body mass. Histopathologically, (mice killed with high doses of GMC-II, given orally) there were diffuse hyperemia of the liver, parenchymal degeneration of the kidney tubuli epithelium, and edema and emphysema of the lungs. The local tolerance with regard to a 5 per cent solution of GMC-II applied to the conjunctiva of rabbits at twofold treatment proved to be good. Determined were the minimal inhibiting concentrations of 14 species of pathogenic organisms of great interest to veterinary medicine (Bacillus anthracis, Erysipelothrix insidiosa, Salmonella gallinarum, Escherichia coli, etc.). The antibacterial spectrum of GMC-II was similar to that of gentamycin sulphate, however, for some pathogenic organisms higher concentrations were required to produce and antimicrobial effect. Similarly to gentamycin sulphate GMC-II had limited absorbtion in the alimentary canal of clinically normal newborn pigs and of birds. At a high rate (0.05 g/kg body mass) GMC-II applied via the crop to birds it was found to maintain the lowest therapeutic concentration in the serum. At the rate of 0.012 (equal to 12000 IU) per kg of body mass for 24 hours GMC-II produced therapeutic effects in newborn pigs affected with colibacteriosis.

Animals↗

Endocarditis of the aortic valve in the dog.

The clinical features of endocarditis of the aortic valve in 24 dogs were reviewed. This condition was found most commonly in large-breed, middle-aged male dogs. Evidence of antecedent infection or immunosuppression was usually not historically verified or found at necropsy. However, an association with congenital heart disease, especially discrete subaortic stenosis, was demonstrated. The most frequent clinical findings were systolic and diastolic murmurs and bounding arterial pulses, with or without signs of congestive heart failure. The most commonly isolated organisms were Corynebacterium sp, Erysipelothrix rhusiopathiae, and Streptococcus sp. In addition to antibiotic therapy, treatment for congestive heart failure often was required. Despite aggressive therapy, most affected dogs died as a result of congestive heart failure, arrhythmias, infarction, sepsis, or renal failure.

Animals↗

Evaluation of the microagglutination test in the diagnosis of Mycoplasma gallisepticum infection in chickens.

The sensitivity and specificity of the microagglutination (MA), serum-plate-agglutination (SP), and hemagglutination-inhibition (HI) test for Mycoplasma gallisepticum (MG) were compared in groups of chickens infected with MG, M. synoviae, or Pasteurella multocida or inoculated with bacterins prepared from Staphylococcus aureus or Erysipelothrix rhusiopathiae. Of the three tests evaluated, the HI test had the highest specificity, but it was the least sensitive. Both the MA and SP tests were more sensitive than the HI test but lower in specificity. The MA test was less sensitive than the SP test in detecting antibodies against heterologous MG strains.

Agglutination Tests↗

[Growth of some pathogenic microorganisms on chemically defined media which were proposed for sensitivity testing (author's transl)].

The growth of 16 bacterial cultures, which belong to the frequently encountered pathogens, in three different chemically defined fluid media was investigated through turbidity measurements in comparison with Mueller-Hinton-broth. E. coli, Salm. dublin, Salm. typhi-murium, Enterobacter cloacae, Proteus mirabilis, Pseud. aeruginosa and Bac. cereus grew in two of the three tested defined media with approximately the same intensity as in the Mueller-Hinton broth. Staph. aureus grew well only in one of the 3 tested defined media. Listeria monocytogenes, Erysipelothrix rhusiopathiae, Pasteurella multocida, Neisseria gonorrhoeae and Brucella abortus showed only in one of the three tested media a barely descernible growth, whereas Strept. faecalis, Strept. pneumoniae, Strept. pyogenes showed no growth in the three tested defined media after 34 hours of incubation. None of the tested defined media can be used for routine sensitivity testing but the use of two of the three tested defined media as a reference medium for the standardization of the complex sensitivity testing media remains theoretically possible.

Bacteria↗

Erysipelas in domestic white Pekin ducks.

Two epornitics of erysipelas were diagnosed in domestic White Pekin ducks. The first was in 2,000 18-day-old ducklings with a 30% mortality. The other was in 2,400 breeder hens with losses of four or five birds a day. Gross pathologic lesions in birds necropsied from both instances were enlarged swollen livers with occasional subcapsular hemorrhages. Pure isolates of Erysipelothrix insidiosa only were cultured from the livers. Histologic examination revealed congestion and multifocal necrosis in the liver and spleen with associated reticuloendothelial cell proliferation. Special stains demonstrated numerous organisms within the reticuloendothelial cells.

Animals↗

Prophylactic application of Propionibacterium avidum KP-40 in swine with acute experimental infections. II. Bacterial infections: pleuropneumonia and swine erysipelas.

The potent immunomodifier Propionibacterium avidum KP-40 (PA) demonstrated prophylactic potency in swine infected experimentally with Haemophilus (Actinobacillus) pleuropneumoniae or Erysipelothrix rhusiopathiae. Animals received PA either together with the respective vaccine or PA only; 3 resp. 4 weeks later all animals were inoculated with virulent pathogens. Eight of 10 swine immunized with inactivated pleuropneumonia vaccine developed mild-moderate forms of infection with temporary stagnation of body weight; application of the vaccine together with PA lowered the morbidity rate to 1 of 10 (p < 0.05). Also in non-vaccinated swine infected with pleuropneumonia or erysipelas PA application resulted in milder clinical symptoms, faster recovery and a larger gain of body weight.

Actinobacillus Infections↗

Treatment and control by vaccination of erysipelas in farmed emus (Dromaius novohollandiae).

OBJECTIVE: To study erysipelas in farmed emus and the treatment and control of the disease by vaccination. DESIGN: A retrospective study of field outbreaks in emus and challenge experiments in mice using field and vaccine strains of the organism. PROCEDURE: Outbreaks of the disease were described. Field strains of the organism were identified and tested by challenge experiments in mice against commercial vaccine strains. RESULTS: Erysipelas was characterised by sudden death in yearling emus. Deaths mainly occurred during the cold wet months. Mortalities of 6 to 10% were seen within the first 7 to 10 days of an outbreak. Clinical signs were uncommon but some birds exhibited lethargy and greenish diarrhoea. Necropsy findings included marked petechial haemorrhages on the serosal surface of the large intestine in particular, pericardial effusion and congestion and mottling of the liver. Treatment consisted of individual or mass medication with procaine penicillin, reduction of stress factors such as overcrowding, and spelling and rotation of paddocks. Isolates from two field outbreaks were identified as strain 21. Complete protection was provided by a commercial strain 2b vaccine against challenge by strain 21 field isolates in mice. Annual vaccination of birds at 4 weeks and again at 8 weeks of age appeared to control further outbreaks on farms where the disease had previously occurred and vaccination appeared to protect for at least 12 months.

Animal Husbandry↗