Prevalence and antibiotic susceptibility pattern of CTX-M type extended-spectrum β-lactamases among clinical isolates of gram-negative bacilli in Jimma, Ethiopia

Table 1 Frequency, distribution and combinations of bla genes among screen and ESBL gene positive Gram-negative isolates

Screen positive species	Total ESBL		Among ESBL gene positive isolates
			SHV E240K + G238S alone		CTX-M alone		CTX-M + SHV E240K + G238S		Total CTXM
	n:	%	n:	%	n:	%	n:	%	n:	%
E. coli (n = 13)	13	100	0	0	12	92.3	1	7.7	13	100
K. pneumoniae (n = 31)	30	96.8	0	0	29	96.7	1	3.3	30	100
E. cloacae (n = 14)	12	85.7	3	25.0	9	75.0	0	0	9	75.0
other Enterobacteriaceae^a (n = 15)	12	80.0	0	0	12	100	0	0	12	100
P. aeruginosa (n = 14)	3	21.4	0	0	3	100	0	0	3	100
other Non-fermenters^b (n = 25)	1	4	0	0	1	100	0	0	1	100
Total (n = 112)	71	63.4	3	4.2	66	92.9	2	2.8	68	95.8

^aincludes 3 M. morganii, 4 P. mirablis, 5 P. stuartii, 2 K. oxytoca and 1 E. hermanii
^bincludes 17 Acinetobacter species (14 A. baumanii, 2 A. pittii and 1 A. haemolyticus), 3 A. faecalis, 4 S. maltophilia and 1 B. bronchiseptica

ISSN: 1471-2334