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The influence of commensal bacteria on infection with enteric viruses

Abstract

The intestinal microbiota exerts a marked influence in the mammalian host, both during homeostasis and disease. However, until very recently, there has been relatively little focus on the potential effect of commensal microorganisms on viral infection of the intestinal tract. In this Progress article, I review the recent advances that elucidate the mechanisms by which enteric viruses use commensal bacteria to enhance viral infectivity. These mechanisms segregate into two general categories: the direct facilitation of viral infection, including bacterial stabilization of viral particles and the facilitation of viral attachment to host target cells; and the indirect skewing of the antiviral immune response in a manner that promotes viral infection. Finally, I discuss the implications of these interactions for the development of vaccines and novel therapeutic approaches.

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Figure 1: Enteric virus interactions with bacterial surface glycans can facilitate viral stability and binding to target cells.
Figure 2: Commensal bacteria can induce a tolerogenic microenvironment that facilitates the establishment of MMTV persistence.
Figure 3: Commensal bacteria can suppress the type III interferon response, facilitating the establishment of murine norovirus persistence.

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Acknowledgements

This work was supported by the US National Institutes of Health (NIH; grant R01AI116892).

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Correspondence to Stephanie M. Karst.

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Karst, S. The influence of commensal bacteria on infection with enteric viruses. Nat Rev Microbiol 14, 197–204 (2016). https://doi.org/10.1038/nrmicro.2015.25

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