Study upon the production of several enzymes from Salmonella gallinarum strains
2000
Kokosharov, T. (Regional Veterinary Station, Haskovo (Bulgaria))
The virulence of 10 Salmonella gallinarum strains was tested via subcutaneous injection of bacterial suspension in the hind paw of adult white mice and evaluation of the resulting oedema. The studies showed that all strains produced actively alkaline and acid phosphatases, catalase and caused proteolysis. They varied with regard to their lipase activity. Seventy percents of all strains were DNA-ase positive, 30% were bound to crystal violet. None of the tested strains produced lysozyme. A high virulence (4+ grade) was manifested by 49% of the strains that were also characterized by their property to inactivate lysozyme in a concentration of 25-12.5 mg/ml. This was the only biochemical marker related to Salmonella gallinarum strains' virulence.
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