Class '''Alphaproteobacteria''', orders Rhizobiales and Rickettsiales.
+
Class '''Alphaproteobacteria''', order Rhizobiales (families Bartonellaceae and Brucellaceae) and order Rickettsiales (families Anaplasmataceae and Rickettsiaceae).
Class '''Betaproteobacteria''', orders Burkholderiales and Neisseriales.
Class '''Betaproteobacteria''', orders Burkholderiales and Neisseriales.