Modified Hodge Test: A Simple and Effective Test for Detection of Carbapenemase Production

Overview

Journal Iran J Microbiol

Publisher Tehran University of Medical Sciences

Specialty Infectious Diseases

Date 2012 Apr 25

PMID 22530087

Citations 49

Authors

A Amjad

Ia Mirza

Sa Abbasi

U Farwa

N Malik

F Zia

Affiliations

Soon will be listed here.

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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