NDLI: Study of CTX-M Type of Extended Spectrum β-Lactamase among Nosocomial Isolates of Escherichia coli and Klebsiella pneumoniae in South India

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Study of CTX-M Type of Extended Spectrum β-Lactamase among Nosocomial Isolates of Escherichia coli and Klebsiella pneumoniae in South India

Content Provider	Springer Nature Link
Author	Mohamudha Parveen, R. Manivannan, Subha Harish, B. N. Parija, S. C.
Copyright Year	2011
Abstract	Data on CTX-M type extended-spectrum β-lactamase (ESBL) produced by Gram-negative bacteria by molecular methods are limited from India. This study was conducted to investigate the prevalence of CTX-M type ESBL producing Escherichia coli and Klebsiella pneumoniae from nosocomial isolates in a tertiary care hospital in southern India. A total of 179 clinical isolates of K. pneumoniae (n = 72) and E. coli (n = 107) were obtained in a period of 3 months and assessed for ESBL production phenotypically. Associated resistance to a panel of antibiotics and Minimum Inhibitory Concentration for 3rd generation cephalosporins was determined. Phenotypically ESBL positive isolates were subjected to PCR for bla $_{CTX-M}$ gene using two sets of primers for the simultaneous detection of all the five major groups of CTX-M types. All the positive isolates were then subjected to a group specific PCR to detect the prevalent group. Out of 179 isolates, 156 (87.1%) were positive for ESBL phenotypically, which includes 39.2% of K. pneumoniae and 60.8% of E. coli. All of them were examined by PCR using two primers for the presence of bla $_{CTX-M}$ genes. Among the 156 phenotypic positive isolates, 124 (79.4%) were positive for bla $_{CTX-M}$ genes, of which 45 (36.2%) were K. pneumoniae, 79 (63.7%) were E. coli. When the 124 positive clinical isolates were further tested with CTX-M group-specific primers, all were positive for the CTX-M-1 group. Our findings document evidence of the high prevalence of multidrug resistant CTX-M group 1 type ESBL among nosocomial isolates in this region. High co-resistance to other non-β-lactam antibiotics is a major challenge for management of ESBL infections. This is alarming and calls for the judicious use of carbapenems, especially in developing countries. This has significant implications for patient management, and indicates the need for increased surveillance and for further molecular characterization of these isolates.
Starting Page	35
Ending Page	40
Page Count	6
File Format	PDF
ISSN	00468991
Journal	Indian Journal of Microbiology
Volume Number	52
Issue Number	1
e-ISSN	09737715
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-01-25
Publisher Institution	Association of Microbiologists of India
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Extended spectrum β-lactamase CTX-M types Antibiotic resistance Nosocomial isolates South India Medical Microbiology Microbiology
Content Type	Text
Resource Type	Article
Subject	Microbiology

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