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Modified Hodge test: A simple and effective test for detection of carbapenemase production.

Abstract

BACKGROUND AND OBJECTIVES
Resistance among bacterial isolates is the leading cause of increased mortality and morbidity worldwide. Carbapenems once thought to be effective are becoming ineffective mostly due to the emergence of carbapenemase. This study was designed to determine in vitro efficacy of Modified Hodge test for detection of carbapenemase production in Gram negative rods.
MATERIAL AND METHODS
The study was done in the Department of Microbiology, Armed Forces Institute of Pathology Rawalpindi Pakistan from January 2010 to December 2010. A total of 200 Gram negative rods from different clinical samples were taken. Those isolates which showed intermediate or susceptible zones i.e 16mm-21mm on disc diffusion were included in the study. These isolates were then subjected to Modified Hodge test.
RESULT
Out of 200 isolates, 138 (69%) were positive for carbapenemase production by Modified Hodge test. Out of 138 MHT positive organisms, the frequency of E. coli was 38%, followed by Pseudomonas aeruginosa (30%), Klebsiella pneumoniae (17%), Acinetobacter baumannii (12%), Citrobacter diversus (2%) and Enterobacter agglomerans (1.4%).
CONCLUSION
Modified Hodge test is a simple test which can be performed in the routine lab for detection of carbapenemases in isolates showing intermediate or sensitive zone diameter on disc diffusion.

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    • Authors

    Amjad A, Mirza Ia, Abbasi S, Farwa U, Malik N, Zia F

    Institution

    Department of Microbiology, Armed Forces Institute of Pathology, Rawalpindi Pakistan.

    Source

    Iranian journal of microbiology 3:4 2011 Dec pg 189-93

    Pub Type(s)

    Journal Article

    Language

    eng

    PubMed ID

    22530087