<unk>  is a gram negative aerobic bacterium in the spirochaete phylum. The species named after Dutch bacteriologist Jan Willem Wolff.
Leptospira wolffii
Helicobacter suis
Salmonella enterica subsp. enterica
Bacteroides dorei
Prevotella bivia
Campylobacter upsaliensis
Yersinia rohdei
Helicobacter bizzozeronii