Hi, I have used both the standard Kraken2 database and the viral genomes (2019) database on usegalaxy.eu. I have gotten very different results from the two databases and I was wondering what is the difference between the two, as the way I understand it the standard database contains viral genome sequences?
Did you find help on this topic?
Missed this when it got posted originally, but here’s information about most of the different kraken2 databases.
Hi all – it looks like the link from @wm75 was dropped by accident!
This is where to review, but he can add more if my guess is wrong! → Index zone by BenLangmead
Hope this helps! 
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