<unk>  (, 'fine, thin' and , 'coil') is a genus of spirochaete bacteria, including a small number of pathogenic and saprophytic species.<unk>  was first observed in 1907 in kidney tissue slices of a<unk> sis victim who was described as having died of "yellow fever".
Leptospira
Salmonella
Giardia
Streptococcus
Cryptosporidium
Shigella
Veronaea
Legionella