Occurrence of Enterobacteriaceae in Raw Meat and in Human Samples from Egyptian Retail Sellers

Table 3

Identification scores for bacteria isolates obtained by Biotyper software (Bruker Daltonik GmbH) for MALDI-TOF MS results. An identification (ID) score >2.30 is regarded as a highly probable species identification; scores 2.0–2.29 indicate secure genus and probable species identification; scores 1.70–1.99 allow probable genus identification and lower scores provide no reliable results.

Bacterial species	Number of strains	ID score; 1.70–1.99	ID score; 2.0–2.29	ID score; >2.30
Citrobacter amalonaticus	1		1
Citrobacter braakii	7			7
Citrobacter freundii	8		1	7
Citrobacter koseri	3			3
Citrobacter youngae	3		1	2
Comamonas kerstersii	1		1
Enterobacter asburiae	2	1	1
Enterobacter cloacae	5		2	3
Enterococcus faecalis	11		1	10
Enterococcus faecium	3		2	1
Enterococcus raffinosus	1		1
Escherichia coli	38		11	27
Hafnia alvei	2		2
Klebsiella oxytoca	2		1	1
Klebsiella pneumoniae	17		10	7
Klebsiella variicola	2		2
Macrococcus caseolyticus	4	1	3
Morganella morganii	17			17
Proteus mirabilis	40		4	36
Proteus penneri	6		2	4
Proteus vulgaris	45		9	36
Providencia rettgeri	1			1
Providencia stuartii	1			1
Pseudomonas putida	1		1
Pseudomonas aeruginosa	5			5
Raoultella ornithinolytica	6	1		5
Serratia liquefaciens	1			1
Staphylococcus aureus	4	2	1	1
Viridibacillus	1	1
Unidentified bacteria	4
Total	242	6	57	175