I think the bacterial RNAse YbeY gene is also conserved. Otherwise, some virulence associated secretion genes maybe conserved too, atleast in some vibrios.

I have done a research lately where I found interesting findings about virulent Vibro cholerae, may be your question is not related to this answer but I think you will find this study useful; if you want to read it faster just skip to the discussion directly

Article Identification of the positively selected genes governing ho...