Host–microbiota interactions and responses to grass carp reovirus infection in Ctenopharyngodon idellus

Abstract

Summary Gut microbiota could facilitate host to defense diseases, but fish–microbiota interactions during viral infection and the underlying mechanism are poorly understood. We examined interactions and responses of gut microbiota to grass carp reovirus (GCRV) infection in Ctenopharyngodon idellus , which is the most important aquaculture fish worldwide. We found that GCRV infection group with serious haemorrhagic symptoms (G7s) showed considerably different gut microbiota, especially with an abnormally high abundance of gram‐negative anaerobic Cetobacterium somerae . It also showed the lowest ( p p Cetobacterium and Acinetobacter . The results suggested that an expansion of C. somerae initiated by GCRV could aggravate host inflammatory reactions through the LPS‐related NLRs and TLRs pathways. This study advances our understanding of the interplay between fish immunity and gut microbiota challenged by viruses; it also sheds new insights for ecological defense of fish diseases with the help of gut microbiota.

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