"Oh, worms." After realising they should probably give further context, they elaborated, "It looks like this is not a virus, so it's possible my scope may be limited. I do have some knowledge of parasites, though, just managing expectations. I'm going to take images of them and search Starfleet medical databases to see if it matches anything on our records." If they already knew what it was, that sure would be convenient, which was why, for the sake of plot, that definitely wasn't going to happen.