Antimicrobial Resistance in the 21st Century pp 269-296 | Cite as
Heteroresistance: A Harbinger of Future Resistance
Abstract
During infection, bacterial populations often contain subpopulations that exhibit reduced antimicrobial susceptibility. The resulting population heterogeneity is called heteroresistance. Since a heteroresistant population can evolve into a resistant one, a heteroresistant infection is a risk factor for the development of complete resistance. We describe heteroresistant tuberculosis as an example of a chronic infection in which enrichment of resistant subpopulations readily progresses in individual patients and threatens successful treatment. Heteroresistance provides such a clear warning that improved DNA-based tests are being designed to identify isolates containing resistant subpopulations while they are still small. We also examine heteroresistance with Staphylococcus aureus as an example of how resistant subpopulations affect treatment of an opportunistic pathogen. Heteroresistance to methicillin resistance emerged via a horizontal gene transfer event that produced methicillin-resistant S. aureus (MRSA), which spread worldwide. Now heteroresistance to vancomycin-intermediate Staphylococcus aureus (VISA) is appearing among MRSA strains. Many other pathogens are also displaying heteroresistance that is often undetected by routine, automated susceptibility testing. Refinement of assays is likely to reveal that antimicrobial heteroresistance is much more prevalent than we realize and that treatment strategies need to be refined now to slow the emergence of new resistance.
Notes
Acknowledgments
We thank the following for helpful discussions and critical comments: Veronique Dartois, Dorothy Fallows, Marila Gennaro, Ben Gold, Barry Kreiswirth, Richard Pine, and George Zhanel. The authors’ work was supported by NIH grants 1DP20D007423, 1R01AI073491, 1R21A03781, and 1R01AI87671.
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