Leptospira, shown here in green, is a type (genus) of elongated, spiral-shaped bacteria. Infection can cause Weil’s disease, a kind of jaundice, in humans.

Leptospira (Greek leptos, "fine, thin" and Latin spira, "coil") is a genus of spirochaete bacteria, including a small number of pathogenic and saprophytic species. Leptospira was first observed in 1907 …