This week we talked all about data types and data organization. We discussed how using data models helps to organize genomic surveillance metadata and specifically mentioned the PHA4GE data specification for SARS-CoV-2. And then Dan Lu walked us through different genomic data structures, what those different structures are useful for, and which repositories each can be submitted to. She finished the talk off with a discussion of handling GISAID rejections and looking at calls in BAM files.