RT Journal Article SR Electronic T1 Microbial adaptation to venom is common in snakes and spiders JF bioRxiv FD Cold Spring Harbor Laboratory SP 348433 DO 10.1101/348433 A1 E. Esmaeilishirazifard A1 L. Usher A1 C. Trim A1 H. Denise A1 V. Sangal A1 G.H. Tyson A1 A. Barlow A1 K.F. Redway A1 J.D. Taylor A1 M. Kremyda-Vlachou A1 T. D. Loftus A1 M.M.G. Lock A1 K. Wright A1 A. Dalby A1 L.A.S. Snyder A1 W. Wuster A1 S. Trim A1 S.A. Moschos YR 2018 UL http://biorxiv.org/content/early/2018/06/16/348433.abstract AB Animal venoms are considered sterile sources of antimicrobial compounds with strong membrane disrupting activity against multi-drug resistant bacteria. However, bite wound infections are common in developing nations. Investigating the oral and venom microbiome of five snake and two spider species, we evidence viable microorganisms potentially unique to venom for black-necked spitting cobras (Naja nigricollis). Among these are two novel sequence types of Enterococcus faecalis misidentified by commonly used clinical biochemistry procedures as Staphylococcus; the genome sequence data of venom-specific isolates feature an additional 45 genes, at least 11 of which improve membrane integrity. Our findings challenge the dogma of venom sterility and indicate an increased primary infection risk in the clinical management of venomous animal bite wounds.One Sentence Summary Independent bacterial colonization of cobra venom drives acquisition of genes antagonistic to venom antimicrobial peptides.