ISOLATION AND IDENTIFICATION OF AEROBIC BACTERIA FROM FRESH AND STORED TABLE EGGS IN KHARTOUM STATE, SUDAN
Salih I. A. Salih, El Ayis A. Abubaker*, Fadlalla E., Rooble S. Abdulahi, Eassa A. Eassa and Abdalla A. O. Abdelrahim
ABSTRACT
In this investigation which lasted in 6 months from January to June of the years 2016 and 2017, a total of 160 bacterial isolates were obtained from 77 egg samples collected from different localities of Khartoum State. According to the cultural characteristics, bacterial morphology and biochemical reactions results, the identified bacteria were: Staphylococci 40.0%, Bacillus Cereus 28.1%, Escherichia coli 24.4%, Salmonella spp. 5.0% and Listeria monocytogenes 2.5%. The isolated Staphylococci were identified as: Staphylococcus aureus 25.0%, Staphylococcus epidermidis 11.3%, Staphylococcus xylosus 3.7%. According to frequency of isolation, Bacillus Cereus came in second place to Staphylococci as causes of eggs contamination followed by
Escherichia coli, Salmonella spp. and Listeria monocytogenes. Gram positive bacteria represented the predominant isolated bacteria (70.6%), compared to Gram negative bacteria (29.4%). Bacteria isolated from market egg samples represented 60 (37.5%) of the total bacterial isolates while bacteria isolated from store egg samples represented 54 (33.8%) and bacteria isolated from farm egg samples represented 46 (28.7%).
Keywords: Staphylococcus aureus, Staphylococcus epidermidis, Staphylococcus xylosus.
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