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Year : 2017  |  Volume : 35  |  Issue : 3  |  Page : 415-416

Survivability and fitness cost of heterogeneous vancomycin-intermediate Staphylococcus aureus


Department of Microbiology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India

Correspondence Address:
Kashi Nath Prasad
Department of Microbiology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow - 226 014, Uttar Pradesh
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijmm.IJMM_17_311

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The aim of this study was to observe the survivability and fitness cost of heterogeneous vancomycin-intermediate Staphylococcus aureus(hVISA) isolates. Survivability study was performed on dry cotton swab, and fitness cost was evaluated by estimating growth kinetics and generation time constant in BACTEC automated system. Total mean maximum time of recovery on primary culture was 4.1 and 7.1 weeks (P = 0.0001) for hVISA and vancomycin-sensitive S. aureus (VSSA), respectively, in dry starved condition. No significant difference between the mean value of lag phase duration (P = 0.89) was noted between hVISA and VSSA isolate in growth kinetics. However, we observed lesser generation time of hVISA isolates compared to S. aureus ATCC 29213 (P = 0.0076). This study concluded that a significant difference in generation time between VSSA and hVISA and suggests that hVISA have fitness cost compared to VSSA. However, further studies with more cases are required.






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2004 - Indian Journal of Medical Microbiology
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