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The investigations were aimed to establish the diversity of conditionally pathogenic microflora in a poultry farm producing eggs for consumption and to determine the critical points of eggs contamination with
pathogenic microorganisms, which could be a risk of developing food toxic infections in humans. The samples of biological material for microbiological investigations were collected in the rooms where laying chickens are kept,
from egg shells, from the equipment, in the room for egg collection, sorting, grading and packaging, from feed and manure. The inseminations were performed on ordinary, selective and specific nutrient media. As a result of
bacteriological and bacterioscopic investigations the presence of Streptococcus colonies was detected on the Peptone Agar medium (room air and egg shell), fungus colonies on Saburo medium (room air and feed), Salmonella
colonies on Bismuth Sulfite Agar and E. coli colonies on Endo medium (faeces). The level of eggs contamination with conditionally pathogenic or pathogenic microorganisms varies depending on the hygiene of the premises,
equipment, primary and secondary packaging of eggs, air currents in the building and on the content of microorganisms in poultry faeces.
Key words: Poultry; Eggs; Biological contamination; Microorganisms; Culture media.
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