Brief introduction 39 species &3 subspecies 19 subspecies relates to human diseases · Common in nature Mainly in natural water sources artificial cold/hot water piping system Most suitable water temperature: 31 36C with rich organic substancesBrief introduction • 39 species & 3 subspecies • 19 subspecies relates to human diseases • Common in nature • Mainly in natural water sources & artificial cold/hot water piping system • Most suitable water temperature: 31~36℃ with rich organic substances