PHASTER is the updated version of PHAST. It uses a more up-to-date database, has access to more computing resources, and is faster.

PHAST(PHAge Search Tool) is a web server designed to rapidly and accurately identify, annotate and graphically display prophage sequences within bacterial genomes or plasmids. It accepts either raw DNA sequence data or partially annotated GenBank formatted data and rapidly performs a number of database comparisons as well as phage “cornerstone” feature identification steps to locate, annotate and display prophage sequences and prophage features. Relative to other prophage identification tools, PHAST is up to 40 times faster and up to 15% more sensitive. It is also able to process and annotate both raw DNA sequence data and Genbank files, provide richly annotated tables on prophage features and prophage “quality” and distinguish between intact and incomplete prophage. PHAST also generates downloadable, high quality, interactive graphics that display all identified prophage components in both circular and linear genomic views.Furthermore, tests indicate that PHAST is as accurate or slightly more accurate than all available phage finding tools, with sensitivity of 85.4% and positive predictive value of 94.2%.

Please cite the following: You Zhou, Yongjie Liang, Karlene Lynch, Jonathan J. Dennis, David S. Wishart “PHAST: A Fast Phage Search Tool” Nucl. Acids Res. (2011) 39(suppl 2): W347-W352 [doi:10.1093/nar/gkr485][PMID:21672955]

News and Updates, Dec 23, 2016

Please input a Genbank accession number or a GI number:(For example, NC_000913 or 49175990)


Select your GenBank formatted file : (Example)


Select your nucleotide sequence file (FASTA format) :(Example)
 Check if your input file is contigs file. The server will concatenate all the sequences together.
Paste your nucleotide sequence here (FASTA format) :

Problems? Suggestions? Please contact feedback