Indian Journal of Medical Microbiology IAMM  | About us |  Subscription |  e-Alerts  | Feedback |  Login   
  Print this page Email this page   Small font sizeDefault font sizeIncrease font size
 Home | Ahead of Print | Current Issue | Archives | Search | Instructions  
Users Online: 593 Official Publication of Indian Association of Medical Microbiologists 
 ~   Next article
 ~   Previous article
 ~   Table of Contents

 ~   Similar in PUBMED
 ~  Search Pubmed for
 ~  Search in Google Scholar for
 ~Related articles
 ~   Citation Manager
 ~   Access Statistics
 ~   Reader Comments
 ~   Email Alert *
 ~   Add to My List *
 * Requires registration (Free)

 Article Access Statistics
    PDF Downloaded56    
    Comments [Add]    

Recommend this journal


Year : 2020  |  Volume : 38  |  Issue : 1  |  Page : 52-57

In vitro and in vivo fitness of clinical isolates of carbapenem-resistant and -susceptible Acinetobacter baumannii

1 Department of Medical Microbiology, Post Graduate Institute of Medical Education and Research, Chandigarh; Department of Biotechnology, Maharishi Markandeshwar Deemed to be University, Mullana (Ambala), Haryana, India
2 Department of Microbiology, Government Medical College and Hospital, Sector -12, Chandigarh, India
3 Department of Medical Microbiology, Post Graduate Institute of Medical Education and Research, Chandigarh, India

Correspondence Address:
Dr. Vikas Gautam
Department of Medical Microbiology,Post Graduate Institute of Medical Education and Research, Chandigarh
Login to access the Email id

Source of Support: None, Conflict of Interest: None

DOI: 10.4103/ijmm.IJMM_19_468

Rights and Permissions

Context: Acinetobacter baumannii is one among the leading nosocomial pathogens in the healthcare settings worldwide. Limited data on relative fitness and virulence of carbapenem-resistant A. baumannii (CRAB) are known. New methods are required to curb the rapidly rising antimicrobial resistance of this bug. Aims: We aimed to study the comparative in vitro and in vivo fitness of clinical isolates of CRAB and carbapenem-susceptible A. baumannii (CSAB). Settings and Design: A total of nine A. baumannii isolates were included in this study. CSAB ATCC-19606 was taken as a reference control strain. Subjects and Methods: Matrix-assisted laser desorption ionisation–time of flight mass spectrometry and gyrB and blaOXA-51PCR were used for species identification. Antimicrobial susceptibility was performed using Kirby-Bauer disk-diffusion method. Minimum inhibitory concentration for carbapenems (imipenem, meropenem and doripenem) was determined using agar dilution method. End point analysis, competitive index (CI), growth kinetics and generation time were determined for CRAB and CSAB isolates. In vivo fitness of CRAB and CSAB was determined using Caenorhabditis elegans host model. Multilocus sequence typing was performed to see the genetic relatedness of the isolates under study. Results: End point analysis, in vitro CI and growth kinetics experiments showed better fitness of clinical isolates of CRAB over CSAB ones. In vivo'nematode fertility assay' using C. elegans also supported the in vitro results. Conclusions: To the best of our knowledge, this is the first study of its kind from India showing difference in fitness of clinical isolates of CRAB and CSAB.


Print this article     Email this article

2004 - Indian Journal of Medical Microbiology
Published by Wolters Kluwer - Medknow

Online since April 2001, new site since 1st August '04